Missy Cooper

Melissa "Missy" Cooper is Sheldon's fraternal younger twin sister. She is a polar opposite in personality of her brother. She is not above physical confrontation, is very charming, and amicable, as well as possessing a very cheeky sense of humor.
==Character Info==
===Young Sheldon===
Missy is a main character. She is portrayed as a bratty, snarky, cynical 9-year-old who fights with Sheldon for attention from their parents. This pushes her and Georgie closer together, whether it's helping each other with homework or trading favors. She and Sheldon shared a bedroom. However, she is shown to have a high EQ and comforts her brother often when she sees that he is feeling down. He does the same for her.
Unlike Sheldon, Missy displayed little to no interest or aptitude in schoolwork, especially math, because she found it challenging. She watched TV the whole time she was home such as ALF, DuckTales, and Looney Tunes while ignoring her homework. The fact that she chose not to prioritize studying could foreshadow her ultimately having to work as a Fuddrucker's hostess for a living while both her brothers achieved middle to upper-class standing as a physicist (Sheldon) and tire entrepreneur (George Jr.). 
Missy has a sweet tooth for candy. Her parents spoiled her on a daily basis by buying her sweets and letting her watch TV all day long, but she is incredibly clever like her brothers when she wants to get her way. The methods she uses often provides comic relief.
====Season 1====
The series starts out with the family eating dinner and having a good time. Missy is forced to go to church with Sheldon and Mary. She talks to Sheldon at service, prompting a woman to tell them to stay quiet. At night, she blames Sheldon for causing the parents to argue again; he rebuffes that argument saying it is about money. The next day at the kitchen table, she tells Georgie that Sheldon could be in a special class and people will make fun of him. (Pilot (Young Sheldon))
Missy is working at the kitchen table, and Georgie comes home, and she comments that Sheldon has no friends. That night, she gives Sheldon a list of people who wants friends. Sheldon reads it. She later eats dinner with Tam at the Table. (Rockets, Communists, and the Dewey Decimal System)
She had received eggs from Billy Sparks. When Missy and the her siblings heard that their dad is at the hospital, Georgie steals Meemaw's car keys and brings Missy and Sheldon to visit their dad at the Medford Community Hospital, where they meet with Meemaw and wait in the waiting room. There they greet their mother who hugs them, Meemaw tells the kids to never speak of what they did to their mother. (Poker, Faith, and Eggs)
She was eating food when she realizes Sheldon is choking on some food. Calling out for her parents to help, she was not able to help at all, to her horror. Later, she was babysat by her grandmother. (A Therapist, a Comic Book, and a Breakfast Sausage)
Missy was not happy that the parents attention is on Sheldon again. (A Solar Calculator, a Game Ball, and a Cheerleader's Bosom)
Missy hears that the boys will go on a trip to Florida is somewhat excited. She asks if they can go to the gun range, since Meemaw told her. The next morning, she was asked where is her brother, and retorts “who cares”. After George, Georgie, and Sheldon left, Missy is at the dining table and asks if she can go to dye her hair orange like Cyndi Lauper. She got her hair done with her mother and grandmother, listening to both banter, while she says she is getting warm while reading a magazine. At home, she says she would have regret getting a color change. (Cape Canaveral, Schrödinger's Cat, and Cyndi Lauper's Hair)
Missy draws on Sheldon’s mask when he gets paranoid about disease. After he finds out and screams her name, she smiles while she sleeps. (A Sneeze, Detention, and Sissy Spacek)
At the dinner table, Missy agrees with her mother and sarcastically comforts Georgie for the test. Later on, she watching Scooby Doo on television. Sheldon comes in with a shovel, prompting to ask in curiosity; he tells her that she found some loose change 75¢ while digging for treasure in Meemaw's yard. She runs out excitedly with the shovel, digging so much that Meemaw trips into one of the holes. Enough holes were dug that Meemaw had tripped and fell into one of the holes. (Spock, Kirk, and Testicular Hernia)
She successfully pulled a splinter out of Sheldon's finger using toy tweezers, though she only did it to make Sheldon stop complaining rather than from a change of heart. (Potato Salad, a Broomstick, and Dad's Whiskey)
Missy is watched over by Meemaw, while Mary and George take Sheldon to be interviewed at Wilmot Academy. At the dinner table, she thought it would be weird without Sheldon. At night, She talks to Sheldon before going to sleep, and asks if he will miss her, but then assertively thinks he will misses her when he's gone. The day Sheldon had left, she sat at the dinner table and notices strong tension between her mother and her father, and mentions she had a great day with her grandmother and Georgie. (An Eagle Feather, a String Bean, and an Eskimo)
At RadioShack, Missy is with her mother and Sheldon. She just listens in to Mary telling Sheldon to go home. At home, Missy tells Georgie that someone called for him, but didn't say her name. Due to her parents having a rough patch in their marriage, she was told to stay overnight at Meemaw's house for one night; she was forced to share a bed with Sheldon because Meemaw didn't have two beds in the room. The next day, after school, she is driven home by Mary. She had a new toy but says it is unfair that Sheldon has a new computer. (A Computer, a Plastic Pony, and a Case of Beer)
At a church event, Missy is dancing while listening to the band playing and didn’t eat the potato salad. At the dinner table the next day, she learns that her mother will take a full time job at the church. She asks if she was pregnant but is shut down. She then asks if they are getting a dog, but is also told no, prompting he to remark that she is not sure she cares anymore. Since her mother took on a job, she has to stay home with Sheldon after school and get adjusted. When Sheldon got a splinter, she tried to help him get it out with some alcohol from her father’s alcohol, and a tool. She got it out, but it caused bleeding so she and Sheldon bandaged it. When Mary came home from work, she was watching TV with Sheldon and was pointed at Sheldon for the injury. (Potato Salad, a Broomstick, and Dad's Whiskey)
At the dinner table, she found out from Georgie that Sheldon supposedly has a girlfriend, but it was someone he admired, and makes some quips about it. In the afternoon as she watches Oprah on television, sheldon was in a fit and used a vacuum around her, to her irritation. (Dolomite, Apple Slices, and a Mystery Woman)
At the dinner table, she found out that the family could not afford cable, apparently. Later on, she is at the backyard cookout and stood by Meemaw of her past roles in Oklahoma. At night, while Sheldon studies for drama class, she also watches the movie too, called “Singing in the Rain”; afterwards, she leaves. At school, Georgie is in class, when Sheldon is becoming rude, and Givens asks him about it; he responds saying he tries to stay out of it. He later hears Sheldon gives a speech over the intercom at the principal’s office, to his name. At home, he is asked about his day, and says that the entire school knows that they can't afford cable. Later at night, he is watching television when Sheldon is trying to find a book, to his annoyance. Three weeks later, he goes to watch Sheldon’s play, and is puzzled that he is not in the role that was assigned. (Killer Asteroids, Oklahoma, and a Frizzy Hair Machine)
Missy is at the breakfast table when she overhears Meemaw saying she loved bowling. She sees what Sheldon is wearing, and notices he is wearing pads and bubble wrap underneath. She is bemused at this act. She later is seen watching a Scooby Doo cartoon, but would take some cash form Sheldon to ward off Bobbi, but this plan falls through. (Jiu-Jitsu, Bubble Wrap, and Yoo-hoo)
Missy is at home reading a Cosmopolitan magazine when Mary comes in and confiscates it. Missy points point Sheldon’s comics, putting Mary into a rage. Later at home, she works with Meemaw to prepare a salad for dinner when Georgie asks where their mother is. She had no idea. She was surprised when Sheldon was forced to make his own food. At night, she asks how was the chicken prepared, to which he got a positive response. Mary comes in and and gives a good night kiss. The next day, Mary makes her meatloaf and yet again gets jealous at the chicken that Sheldon made, but is grateful for the food she had. At night, she is watching Looney Toons as Mary gets started on dinner, and is annoyed at the fact that a tornado warning interrupts the program. She is forced to hide with Sheldon in the bathrub and hugs him. She uses the bathroom as everyone else goes out to check on the house. (A Mother, a Child, and a Blue Man's Backside)
Missy is at the table when she meets Dr. Sturgis, who was invited to the table. George later takes Missy to Red Lobster and shows her how to eat it. (Summer Sausage, a Pocket Poncho, and Tony Danza)
Missy is seen at the dinner table eating, while she listens on. She and Georgie prattle on about who’s the boss, Georgie thinks it’s Tony Danza while Missy think its the blonde lady (Angela), Georgie calls Missy an oddball. (Vanilla Ice Cream, Gentlemen Callers, and a Dinette Set)
====Season 2====
Missy had given spicy gum to Sheldon, who vomits in the kitchen sink. Later, she sleeps but is kept awake by Sheldon who is disturbed by a small sound of the refrigerator. She is not happy with Sheldon, who had opened up the fridge, and encourages Sheldon to take on a paper route job. When he accepts and starts out on his route, Mary follows him via car to ensure he accomplishes his task. (A High-Pitched Buzz and Training Wheels)
She later is somewhat happy that Sheldon has a peer, hoping he has a friend. (A Rival Prodigy and Sir Isaac Neutron)
One Sunday, she overhears Sheldon wanting to visit a local Radio Shack. She was a bit talkative. Later, she was at home and watched by Meemaw while her parents attended the funeral of Stephanie Hanson's daughter. During the week, she was tucked into bed by George Sr, her dad, and insisted on a kiss because it was typical of Mary to do so. (A Crisis of Faith and Octopus Aliens)
As usual, she is tucked in by Mary and calls Sheldon weird. Later, she noticed her mom also seemed weird and she tried to comfort her but is somewhat rebuffed. (A Financial Secret and Fish Sauce)
Older Sheldon narrates that she wanted to eat Sheldon's books when they were two. Professor John Sturgis wanted Missy and Sheldon to participate in a twin study. Their parents agree to the study. Dr. Thorpe tells Missy the same purpose of the test. But before she can start, Missy makes some requests about her appearance in the video recording, ranging from the position of the camera to whether or not she has food in her teeth. She also has a few questions that are less about the test but more about the doctor; all the while, the parents watch from another room. Though Dr. Thorpe tries to get Missy to focus on the test, she briefly inquires about what she knows about the other doctor. "When you're not looking, he stares at your tushie." Connie and Dr. Sturgis are equally impressed with her over this.
When the test is over, the two doctors ask the kids how they felt about doing it. Missy is delighted to meet her own doctor, to whom she is very sympathetic.
She gets some tests on empathy: a test that shows she has a lot of empathy. Dr. Thorpe appreciates her fashion advice as they are now romantically involved with one another. Mary offers Missy to select a restaurant. Much to the chagrin of George (and the delight of Meemaw), Missy selects a Red Lobster franchise, convincing him that his chance of getting a motorboat are now lost.
In the evening, Missy reveals to her father that she knew money was paid and wants a share; She is tricked into asking Sheldon to do the math and get it from him. (A Research Study and Czechoslovakian Wedding Pastries)
Missy is excited for Halloween and likes how her mother is now in charge of Heck House. She accompanies her brother, Tam, and Billy Sparks. When asked where Billy went, she points out he went out to behind a tree in order to urinate. 
She ended up coming to a house; the owner recognizes the fact that Sheldon is recognized as Carl Sagan. (Seven Deadly Sins and a Small Carl Sagan)
One early Friday, She is eating. Meemaw expects the kids to help with a yard sale. Missy learns about haggling from Meemaw. She uses the technique with Billy Sparks; he agrees to pay 50¢ per week for 10 weeks so that $5 is paid for a raccoon statue. (Carbon Dating and a Stuffed Raccoon)
Missy is at dinner when the phone rings. She gets up, remarks she probably is getting popular, and picks up the phone. She says is Pastor Jeff and it is for Mary. (A Math Emergency and Perky Palms)
On a Saturday, Missy is helping Meemaw set up tables for the yard sale. She is not familiar with the concept of haggling, so Meemaw explains it to her. Mary comes over, and Meemaw had to explain that she is indeed selling her late husband’s items such as gold clubs, clothes, and pipes, but it is just stuff and Mary should get over the sentimental value. She talks to Billy, who is interested in the racoon taxidermy. They make a deal where he would pay the initial 50 cents, and a few cents each week until the full $5 is paid off. They agree to it. (Carbon Dating and a Stuffed Raccoon)
Missy asks a magic 8 ball if she will be a cheerleader for the Dallas Cowboys when she grows up; she is greeted with “not likely”, a disappointing outcome. She also wonders if she’ll be a Houston Oilers cheerleader, and is greeted with the answer “Signs point to yes”, and predicts she will marry a quarterback. (Carbon Dating and a Stuffed Raccoon)
At night, Missy is in her room combing her doll and asks Sheldon questions about why is he taking notes. When Thanksgiving arrives, the family goes around the table to say what they are thankful for. She admits she blabbed about. She admits that she was surprised that George wants them to move to Oklahoma for his new job opportunity. While she watches TV, she is happy that there are two kinds of cartoons for Ghostbusters; she at the same time overheard her mother sob to her grandmother about potentially uprooting the family. Sometime later, she is told by George that despite his interview at the University of Tulsa, he declined the job so he can stay with the family. (Family Dynamics and a Red Fiero)
Missy is at a mall when she encounters Paige Swanson. They talk and she asks her mother if she can go to the Hello Kitty store. Afterwards in the drive home, she asked her mother if Paige can sleep over, she can have Sheldon’s bed. The next day, she greets Paige when she arrives. They have a fun night of activities including spending time in a hammock, and activities. Back home, Missy tells Sheldon that was pathetic. He tells Missy he realizes he might not be cut out for a life of antics and shenanigans. After Missy says he’s going to grow up to be a weirdo, Sheldon admits he was hoping it would get easier as he grew up, but now he’s not so sure it will. When Missy sits down to comfort her brother, she sets off a whoopie cushion.(A Stunted Childhood and a Can of Fancy Mixed Nuts)
====Season 3====
Missy is learning football from her dad. When Georgie comes and has a proposal, she is curious about his plan. She later prays with the family before dinner. When he comes back and showers the room with the money he earned, she is super happy about it. (Quirky Eggheads and Texas Snow Globes)
====Season 4====
Missy wanted to attend a dance at school. Mary disapproves because of the film Footloose, which was warned against by Pastor Jeff. Later, she asks Georgie about the school dance and how Mary allowed him to go. He said he just went without permission and gives her a VHS tape of Footloose. She watches the film and tries to argue with her mother by using the Bible quote used in Footloose, but refuses to talk to her when she is denied going to the dance. She later watches it. At night, she is ready to sneak out of the room when Mary comes to the door and tells her it is OK if she goes to the dance. (Crappy Frozen Ice Cream and an Organ Grinder's Monkey)
One time, Missy was sitting watching television with Sheldon sitting with his feet on the sofa. He wants to break rules, and Missy pulls his leg and goes off the sofa.
During a drive home from school, Missy said Sheldon was crazy when he asked Mary for a new video game that costed USD $49.99. Later, she went on a date with Marcus Larson, and later was dropped off in the car driven by her brother and his girlfriend. (A Virus, Heartbreak and a World of Possibilities)
John Sturgis comes to dinner and everyone is having a good time. They explore alternate universes where members of the family are different. She imagined herself the smart one where she has glasses and tells everyone about black holes. (A Black Hole)
Missy walks home mad and goes to her room. Meemaw knocks and is rebuffed. She starts playing music in her room. It is over boy problems. George comes in and tries to talk to her, but she puts her head under the pillow. She put a “do not enter” sign, but Sheldon ignores it. He comes in and talks to Missy and tells Missy that her poster of Cyndi Lauper is part of his routine; Sheldon calls her irritable and she rips his image of Professor Proton. George enters and asks around, making her cry. She gets up, hears her parents arguing, and leaves the house via the window. As she walks, she is caught up by Sheldon, who had suspected she would be outside. She leads Sheldon to a cabin in the woods where they sit. This cabin was used by Missy when she wanted to be alone. They sit there and talk about things; Sheldon apologizes to her. She tells Sheldon and bets $1 that he will not be talking about Star Trek in 2 decades, Missy still hasn't paid Sheldon. (The Wild and Woolly World of Nonlinear Dynamics)
====Season 5====
While she is at the cabin, she talks about having to compete with a 7th grader who took Marcus’s affection. As a result, she reconnects and bonds with Sheldon and puts away her feelings. Soon enough, Georgie comes and find them. He tells them that George is in the hospital and they need to go. They go home and are restful afterwards.
====Season 6====
Missy is at home and can't sleep with the situation regarding Mandy looming large over the family; she talks to Sheldon. She and Sheldon spot a woman knocking on Meemaw's door and goes out to confront her, and discovers the woman is Mandy. They talk and connect. Missy sits with her when Mary arrives; she goes home. On Sunday morning, she tells her mother that she will accompany her to church. She also gets Sheldon to go as well. At church, she is acutely aware of the people judging them slightly for Georgie's act. She is forced by Mary to leave. (Four Hundred Cartons of Undeclared Cigarettes and a Niblingo)
Missy says grace at the table. She goes to the room and asks Sheldon about the finances. She is told that their parents will run out of money by the end of the year; she is not happy that she will lose out on Christmas gifts. She considers getting a job. She goes to King Kong Comics and gets a job after impressing Nigel; she had listed a comic and her favorite characters are all of them. This impresses him and gets a job as a result. She goes home and boasts to Sheldon; making him jealous. That night, she hears a proposal from Sheldon about the cryptocurrency as a manner to earn money. She is reading a Batman comic and is perplexed at his personas. Later on, Sheldon comes into the store, and she greets him; She tells him about the new Green Lantern comic; if he needs help, she is at the counter. (Future Worf and the Margarita of the South Pacific)
When Mary develops a liking to reading books, Missy is agitated to use a bathroom, but is prevented because Mary is obsessed with reading and finishing it. She later meets Mandy at the dining room table. She later wants to use the bathroom again but her mother is using it, who tells her to use the garage sink. (Passion's Harvest and a Sheldocracy)
Missy comes home unhappy that she is having boy trouble. Her mom tries to help but rebuffs her and goes to Meemaw for help, but does not help too much. At school, she tells Heather about it, and Heather asks out the boy instead. She later goes on a lunch date with Mandy, where they bond and get the idea that she could be blonde and attractive. At night, she dyes her hair in a disaster attempt. In shame of confronting her family, she climbs out the window and goes to Meemaw. Meemaw drags her back home, to the shock of everyone. (Blonde Ambition and the Concept of Zero)
Missy comes home and finds out her parents are engaged in sexual acts, to her disgust. She is also disgusted that in the morning, they are also kissing, so she just grabs her food to go to school. She later comes to Georgie to talk about parents being weird. She sits in Meemaw's living room and witnesses a fight between Georgie and Mandy. (A Resident Advisor and the Word 'Sketchy')
Missy is happy with Mandy over for dinner. The next morning, she tells Sheldon to not bother watching television because Wayne Wilkins is sleeping there, and they talk to their mother. At school, she is in a class taught by Darlene Wilkins and asks several questions about their relationship, to her fury.(An Ugly Car, an Affair and Some Kickass Football)
Missy is working at the comic book store and sells a comic to Nathan. Sheldon wanted it, and is not happy. Later, Nigel tells her to work night and sort the comics into a computerized inventory system with Sheldon. Nathan is invited over to help with the system inventory to her frustration, and she leaves the store. (A Tougher Nut and a Note on File)
Missy starts dating a boy named Dean at Meemaw's house, but dumps him when he wants to spend more time with her grandmother than with her. (College Dropouts and the Medford Miracle)
She helps Georgie with the Video Village store. She talks to a few guys including Charlie, who was way older but didn't tell them. Her dad comes in and tells Charlie to leave. On the way home, she tells George that she knows about him and Brenda Sparks in the chicken coop. (Ruthless, Toothless and a Week of Bed Rest)
She had pitched ideas for Mandy's baby shower. She later talked to Mandy right before the baby shower, and lifted her spirits so she came down from her room to the living room. During it, she sees Brenda give her bra pads and wanted to know about it, but she gets shut. (A Baby Shower and a Testoterone-Rich Banter)
Missy attends a party at the Gamma Kappa fraternity, having been invited by a friend's older sister. She runs into Sheldon, who is looking for Paige, and he turns off the music at the party to try to talk to her. They get kicked out and run into Paige, who is going to another party with an older guy. Missy tells the guy Paige's real age and he leaves, so she and Sheldon try to catch her. Missy tries to cheer up Paige by reminding her how smart she is, and she takes her to Sheldon's dorm to rest. Missy lies to her parents the next day about being at Heather's. (A Frat Party, a Sleepover and the Mother of All Blisters)
Missy is at school when her father does not pick her up because he is at Medford Community Hospital. She talks to Billy a bit, and rebuffs any suggestion that her dad and his mother are secretly dating. She decides to walk home. (A Launch Party and a Whole Human Being)
At home, she has teen angst because she was forgotten. George knocks on her door and talks to her, and she reveals her dislike over being forgotten earlier that day. The next day, she made some food for her father with a sassy note saying to not forget her this time. She tries to hang out with Mandy but she is too busy to pay any attention to her. At school, during an exam, she talks to Billy, but is told not to cheat by Darlene Wilkins; She replies that Darlene knows about cheating, an act that results in both of her parents picking her up for her disrespectful attitude. She also mentions that her name is no longer her last name Wilkins anymore. 
That night, she walks by her parents room and is shocked to see Mary hug Sheldon; Fed up, she goes to her room, packs things up, and drives the truck away. (Teen Angst and a Smart-Boy Walk of Shame)
Missy took the truck and drove out. She saw that the fuel gauge is close to empty so she goes and fills up at a gas station. She calls Paige and picks her up and they drive eastward with the destination of Florida. They stop at a diner and eat, and leave without paying. The next day, they are out on a road when a sheriff deputy Larson pulls them over and she confesses to her about her age. They are forced to sit in their backseat and talk, while waiting for their parents. Missy is grounded by her parents and forbidden from seeing Paige. (A Stolen Truck and Going on the Lam)
Missy has been grounded and not allowed to watch television, listen to music or read magazines. When the parents are gone, she sneaks into the living room and inserts a VHS of Beverly Hills 90210. Sheldon comes in and tells her that she is not allowed to watch it. Missy does manage to get Sheldon to understand her situation by alluding to a Star Trek two-parter. 
She gets him to explain the plot of the episodes after he watches them, but he misses the subtext; She tells him to watch it again and pay attention to the subtext.(A German Folk Song and an Actual Adult)
Missy was at the table when she tells Sheldon that she thought he always sucked. Then later tells him that no one wants to hear him complain. (A New Weather Girl and a Stay-at-Home Coddler)
Missy went out again with Tonya, smoking cigarettes and hanging out. She comes home and is spotted by Sheldon, who is trying to acclimate to the time zone in Germany. Sheldon confronts her, but she rebuffs him, convincing him that if he tattles on her, he probably won't be able to go to Germany. When Sheldon goes to Mary, she pretends she just got woken up by Sheldon. The next day, Tonya is over, and Sheldon imagines them plotting to rob a mall. In their room, Sheldon barges in and demands that she should not break any more rules, promising that they won't go out. This doesn't work, as he still snitches on them. George Sr. and Mary talk to them, and she convinces them about their lack of intention to commit any crime or wrongdoing. She angrily tells Sheldon she hates him. (A Romantic Getaway and a Germanic Meat-Based Diet)
Missy is at her room when Sheldon gets her attention with the knocker. He tells her that he apologizes for ratting her out; she gets fed up and returns the radio to his room. She accompanies the family to the airport and reluctantly hugs Sheldon and then goes to the gift shop. On the way home with George, she asks about tornado warnings, They lie down in a ditch. When the tornado dissapates, Missy apologizes to George for how she has been acting recently as they get up and get in the truck. (A Tornado, a 10-Hour Flight and a Darn Fine Ring)
====Season 7====
Missy steps up in the household, she separates George, Meemaw, Georgie and Mandy into rooms. (A Wiener Schnitzel and Underwear in a Tree)
While Missy is cutting coupons, Mandy comes in and tasks her to watch the baby, Missy forces Jim and George to go to the grocery store and watch the baby. Later, Missy and Georgie talk in the middle of the night, Missy realizes she’s not being forced to be an adult. Later, Missy tells George that she’s no longer helping in the household and forces everybody to follow a chore list. (A Roulette Wheel and a Piano Playing Dog)
Missy goes to the mall with her new friend, Taylor. Later, George asks Missy if Taylor is a boy, Missy says yes but she says that he REALLY doesn't like her, George asks if he’s a gal pal, Missy says yes but later at Taylor’s house, they’re seen making out and Missy tells him that he told George that he’s gay, he says okay and then they continue making out. Later, Missy gets a call from Sheldon, but she dismisses it when she gets another call from Taylor. Later, Missy calls Mary and tells her that Sheldon might be in trouble and that he’s stuck in a train station somewhere in Germany. Later, Missy asks George if its okay that she and Taylor go to the other room and listen to music. George agrees but only if they close the door. (A Strudel and a Hot American Boy Toy)
Missy, along with her dad, Georgie, Mandy and CeeCee, are at the airport in Houston, Texas welcoming Sheldon and Mary back from Germany. When they get back home, she suggests that Sheldon sleeps in the garage after Mandy refuses to give him his room back. The next day, Missy goes shopping for back to school clothes with Taylor, only for him to break up with her later that day. She seeks comfort in her mom after the breakup and she tells Mary the story in her room. (Ants on a Log and a Cheating Winker)
Missy walks in on Mary watching Reverend Travis on TV, making fun of his hair. She then goes over to Billy's house to hang out, suggesting that they throw a party due to his mom being away for the weekend. Missy gets the idea to buy beer for the party for drinking games, despite Billy bringing up that they are too young to drink. She seeks advice from Georgie, who dismisses the idea and instead gives her fireworks. She also talks to Mandy, but she does not approve. Later, Missy and Billy try to buy beer and the former lies about her age to two guys. She then uses Billy to get inside and buy beer as the two guys suspected he was an adult. Missy tells Brenda about the party. The next day, after the party, as the Coopers are welcomed back into the church, Missy throws up in the donation plate, and Meemaw and Mary realize she was drinking. (A Frankenstein's Monster and a Crazy Church Guy)
Missy tries to drink coffee because she couldn't sleep because of the noise, but Mary's talk about she and George's long distance caused some pent up "feelings" made Missy leave. (Baptists, Catholics and an Attempted Drowning)
Missy attends Mandy and Georgie's wedding. (A Proper Wedding and Skeletons in the Closet)
Having learned of her father's passing, Missy deals with lots of pain and rage, as she snaps frequently. She meets up with Billy, who says they now have something in common, as he says his father won't be returning from New Jersey. During her father's funeral, Mary tells Missy if she would like to speak to George before they close the casket, she agrees and stands up to do so. During her talk, Missy cries, remembering all the times she had with her father, reminiscing about the time she went to Red Lobster with George. (Funeral)
Mary plans for Missy and Sheldon to get baptized, to which both are reluctant. While Missy and Sheldon talk in their old room, Meemaw comes in and begs them to get baptized and that she's afraid to see her daughter like this, Missy and Sheldon agrees to it and they decide to get baptized. However while in church, Pastor Jeff unknowingly reminds Missy again of her father's passing which makes Missy's rage lead her to snap at Pastor Jeff and back out at the last moment. Her last scene is her and Sheldon saying goodbye to each other before he heads to CalTech. (Memoir)
===The Big Bang Theory===
Missy is first mentioned in "Pilot" (S01E1). When Sheldon and Leonard are at the sperm bank, Sheldon mentions that Missy works as a hostess at Fuddruckers.
Missy first appeared in "The Porkchop Indeterminacy" (S01E15). When Leonard, Howard, and Raj find out Sheldon has a sister and that she is quite attractive, they fall over each other trying to get her attention. Raj is inspired to begin taking an experimental medication to overcome his pathological shyness. Missy is convinced to stay over with Sheldon and Leonard. Sheldon does everything in his power to ignore and avoid talking to Missy, neglecting to do anything about her being stalked and made uncomfortable by his colleagues.
When Sheldon states that he'll decide who Missy dates, she asks to speak with him privately. Sheldon reveals to Missy that she has the potential to produce a second Sheldon, even a second Sheldon that is, "taller, smarter, and less prone to freckling, a Sheldon 2.0, if you will"). Missy tells him that she is fine with him acting like a brother who cares about her, but if he tries to tell her who to sleep with, they are gonna go "round and round" like they did when they were children. This flies over Sheldon's head and he suggests Missy donate her eggs and cryogenically store them until he finds the right sperm donor to fertilize them before implanting them into her body. By this act, he suggests, "everybody wins". Missy then begins painfully squeezing her brother's testicles until he withdraws the statements.
Missy finds more of an ally with Penny, who has become slightly immune to the quartet's geekiness, as well as helping Missy extricate herself from them and lets Missy hang out in her apartment. Leonard, Howard, and Raj all knock on Penny's door to ask Missy out, but they fail in the end. When Raj goes to ask her out, she says that she was waiting for him to show up and calls him a "cutie-pie", but Raj's medication starts wearing off so he is unable to talk to her and leaves looking sad.
Before she leaves, Missy tells Sheldon that she is proud and reveals that she brags to her friends about her brother "the rocket scientist", which sparks him to correct her that he's a theoretical physicist, noting the difference. After she leaves, Sheldon mutters back to his apartment saying that being a rocket scientist is beneath him.
Sheldon mentions her in "The Jiminy Conjecture" (S3E02), when Howard, Sheldon, and Raj are trying to capture Toby/Jiminy and distinctly hear cricket chirping down the apartment building's elevator shaft. As tensions rise, Howard threatens Sheldon with, "Don't push me, Sheldon. I may be small, but I took Kung Fu when I was 13, and I remember a good deal of it," Sheldon responds with, "Oh really? Well, I grew up with an older brother and a very contentious twin sister and I believe I could easily best you in any physical confrontation, be it noogies, swirlies, or the classic 'Why are you hitting yourself?'"
Sheldon's family pedigree, depicted briefly in "The Cruciferous Vegetable Amplification" (S4E02), shows an older brother as well as his twin sister.
In "The Cooper Extraction" (S07E11), Missy is about to give birth to a baby in Texas. Since her husband is recovering from a terrible motorcycle accident, Sheldon has to go back to look after her. She does not appear on screen in this episode, only a scream as she gives birth is all that is heard from Missy.
In "The Fortification Implementation" (S8E20), Sheldon tells Amy that his brother and sister built forts in the living room and wouldn't let Sheldon in, which he hated so much.
In "The Maternal Combustion" (S8E23), Sheldon tells Leonard's mother Beverly that his brother and sister are mouth breathing idiots.
In "The Matrimonial Momentum" (S9E01), Mary Cooper mentions that since Missy is married and their brother is dating a "whore", she wants Sheldon to keep her grandmother's ring which she gave Sheldon for Amy.
In "The Meemaw Materialization" (S9E14), Sheldon reveals that he got an iPhone for Meemaw Constance as a Christmas present but she is completely unaware of it. He had Missy slip it inside Meemaw's luggage when she flew in from Texas so Sheldon could keep track of her location.
In "The Celebration Experimentation" (S9E17), Sheldon says that Missy and her friends used to torture him on their birthday and on their 6th, tricked him into believing that Batman was coming. This led to Sheldon hating his birthday and he therefore kept it a secret until "The Intimacy Acceleration".
In "The Sibling Realignment", according to George after their father died, their mother was a mess and Missy was no help because she was just a "dumb teenager".
In "The Bow Tie Asymmetry", Missy attends the wedding of her twin brother appearing physically for the first time in a decade. She is currently pregnant and separated from her husband. She is happy about the separation, but not thrilled about the baby. Amy tells her how happy she is to finally have a sister.
In "The Change Constant", she texted congratulations to Sheldon and Amy for winning the Nobel Prize in Physics.
In "The Stockholm Syndrome", in Sheldon's speech he thanked his family for all their support which included Missy.
==Family==
*Father: George Cooper Sr.
*Mother: Mary Cooper
*Brother: George Cooper Jr.
*Twin Brother: Sheldon Cooper
*Grandmother: Meemaw
*Grandfather: Pop-Pop
*Uncles: Carl, Edward, Uncle Roger; There is another uncle who gave children gifts like Santa and was not arrested in Oklahoma for his actions.
*Aunt: Aunt Ruth
*Husband: Unnamed (currently separated)
*Son: Unnamed
*Son/Daughter: Unborn (as of "The Bow Tie Asymmetry")
*Son/Daughter: Unnamed (Mentioned in the Young Sheldon episode "A Baby Tooth and the Egyptian God of Knowledge") (uncorfirmed)
*Son/Daughter: Unnamed (Mentioned in the Young Sheldon episode "A Baby Tooth and the Egyptian God of Knowledge") (unconfirmed)
==Trivia==
*She calls Sheldon by his nickname, "Shelly", as does their mother.
*When they were kids, Sheldon turned her Easy-Bake Oven into a furnace for baking ceramic semiconductor substrates for homemade integrated circuits to make a robot to defend his room from her.
**This would appear to create a continuity error, as Young Sheldon shows that Sheldon and Missy shared a bedroom, however, this was only until season 5, episode 4 "Pish Posh and a Secret Back Room" when they got their own rooms, so it could have taken place still.
*Despite their differences, Missy is very proud of Sheldon and his accomplishments, and tells people Sheldon is a "rocket scientist", which he feels deeply offended by because he is a theoretical physicist, which he views as much more prestigious and tells her that she might as well tell people that he is a toll collector at the Golden Gate Bridge.
*When Leonard offered Missy to stay with them, she reveals that Sheldon does not like company and he used to send his imaginary friends home at the end of the day when he was a child: he denies it, saying that they were "imaginary colleagues".
*She once had a dog who made strange noises, which she later had put down.
*It's revealed in the Pilot that she is a hostess at Fuddruckers when Sheldon is expressing concern of "committing genetic fraud" about donating sperm at a high-IQ sperm bank. 
*In the episode "Summer Sausage, a Pocket Poncho, and Tony Danza" of Young Sheldon, it was revealed that her full first name is Melissa, and "Missy" is a nickname.
**Incidentally, Melissa is the first name of the actress who plays Bernadette, Melissa Rauch.
*Her mother dismisses her as "dumb as soup" in "The Luminous Fish Effect": though she is likely nowhere near as intelligent as her brother, she seems witty, presentable, and funny. Her oldest brother even stated he took care of Mary and Missy while Sheldon was in college, describing Missy as a dumb teenager. Though Sheldon also mentioned in "The Cooper Extraction", it took Missy six years to graduate from high school, implying her mother's comment about her intelligence isn't wholly inaccurate. Missy graduated high school when she was 19 or 20 years old. That would be the year 2000 or 2001.
*Missy unfortunately seems to be the least successful Cooper sibling, with Georgie being a self-made millionaire and Sheldon being a Nobel Prize-winning scientist. All that is known about Missy is that she worked as a restaurant hostess, was the mother of four children (being unenthusiastic about the second pregnancy), and was separated from at least one husband. 
**However, she was mentioned to be a hostess in 2007: she certainly had enough time to move forward with her life like Penny did, who moved from waitressing to working in pharmaceutical sales. Penny succeeds with her good looks and social skills, and so could Missy. 
*When she first meets the gang at Caltech, she tells them that she spent nine months with her legs wrapped around Sheldon's head.
*She used to obligate Sheldon to do whatever she wants by squeezing his testicles. As an adult, she still does it, but now when she gets mad at him when he suggests some absurd ideas, and if he is acting ridiculously stubborn.
*Sheldon considers her, with his help in choosing a proper and approved-by-him mate, the future mother of a "Sheldon 2.0". As he considers himself to be a "superior genetic mutation", and with Missy being his twin sister (though still also "mediocre stock"), her DNA has great potential in producing a new version of her brother, likely even superior to him. She, however, doesn't see it that way.
*She does recognize that "Mediocre stock" is an insult.
*She is taller than Leonard, Penny, Raj and Howard, like her brother.
*In one episode, Sheldon mentions that she had a guinea pig called Snowball, who ended up bursting into flames when Sheldon put him in a home-made CAT scanner.
*Her husband's name and her son's name are both unknown.
*Missy is the younger twin, confirmed in Young Sheldon.
*She finally reappeared in the season 11 finale, at Sheldon and Amy's Wedding. This was her only physical appearance of her and her actress Courtney Henggeler in a decade.
*In the episode "The Cooper Extraction", it's revealed that Missy got married and was having a baby.
**In "The Bow Tie Asymmetry", it's revealed that she is pregnant with her second child and she and her husband are separating.
***As shown by her sarcastic reply upon being congratulated her second child, she isn't quite thrilled about her second pregnancy.
***Raj is shown to be delighted upon hearing Missy's separation from her husband. With him having conquered his selective mutism and experience in dating and now with Missy single, there is an indication that a possible romance may start between them. She did show interest in Raj in season 1, though this was a decade prior.
***In "A Baby Tooth and the Egyptian God of Knowledge", it's stated that Missy ultimately ended up having a total of four children. But it was never confirmed.
*Missy had the greatest break between physical appearances on the show with a ten-year gap for fictional characters. Ramona Nowitzki was second with a nine-year gap between appearances. Leslie Winkle has a six-year gap between appearances. Penny's father Wyatt had a five-year gap between appearances. Real-life scientist George Smoot had a ten-year gap between appearances. However, this might be debatable since she was heard once in the Season 7 episode "The Cooper Extraction" screaming since she was in labor and preparing to give birth to her son, which means that she had a 5 year-gap between her appearance in Season 1 and the Season 7 episode and a 4-5 year gap between the Season 7 episode and her second physical appearance in the Season 11 finale "The Bow Tie Asymmetry".
*There was no appearance or mention of Missy's second child, so whether it's a boy or girl remains a mystery.
*It is unknown what relationship she has with Sheldon's kids (her nieces and nephews).
*It is unknown what her and Mary relationship was like after Sheldon left for California for graduate school, Georgie moving out and begin his tire empire and her father death. After all three of them were out of the house and it was just her and Mary and continuing having an estranged relationship. 
*
==Gallery==
Missy Cooper - signed.jpg|Sheldon's twin sister Missy Cooper.
Missy107.jpg|Missy suffering attention from the guys.
Missy Cooper 106.jpg|Sheldon introduces his twin sister.
Missy103.jpg|I don't know why you pimped me out for a piece of cheese.
Missy102.jpg|Howard asking Missy out.
Missy Cooper.jpg|Sheldon reacting to Missy's threat.
The-Big-Bang-Theory-The-Pork-Chop-Indeterminacy-1-15-the-big-bang-theory-10429365-720-480.jpg|Sheldon's beautiful twin sister.
Inde5.jpg|Sheldon introduces his twin sister.
The Porkchop Indeterminacy 04.jpg|Raj hitting on Missy.
The Cooper Extraction 19.png|Sheldon calling from Texas while Missy is in labor.
TBTA-3 Amy and Missy embrace.jpg|I always wanted a sister.
TBTA-5.jpg|Visiting.
Missy Cooper pregnant and sits on table.jpg|Pregnant sister Missy.
The Bow Tie Assymetry 9.jpg|Sheldon's siblings.
TBTA-10.jpg|Fun with Flags puts me to sleep.
TBTA-31.jpg|Watching Amy come up the aisle.
Sheldon and Amy's wedding - Missy Cooper and mother.jpg|The Coopers and the Wheatons.
TBTA-38.jpg|If you need any help.
Aws35.png|Raj picking up Mary and Missy.
Aws37.png|Yes.
Aws38.png|We're separated.
Aws39.png|Whoopee!
Aws45.png|Look who I have!
Aws47.png|Missy, Amy and Sheldon.
Aws48.png|This is my fiancée Amy.
Aws118 - Mary makes a comment.png|Mary applauding Penny.
Aws49.png|I've always wanted a sister.
Aws50.png|Amy meets Missy.
Aws51.png|Oh my God!
Aws52.png|There's Mama's girl!
AWS65 Family meet before wedding.png|And did you know my Amy was Amelia Earhart in the eighth grade.
Aws69.png|After Mrs. Fowler takes down actors.aws96.png|Raj has a question.
Sheldon and Amy married 4.png|Raj's question.
Aws107.png|Why aren't tire tires on any of those Star Wars vehicles?
Aws109 Amy and Sheldon's Wedding - looks back.png|Watching Stuart answer the Star Wars questions.
Sheldon and Amy's wedding 3.png|Excuse me. Where are you going?
Aws119.png|Mary told to sit down.
Aws150 Mark Hamill weds Amy and Sheldon.png|of Sheldon Lee Cooper
Aws152.png|Proud family.
Aws182.png|I'm here if you need me to step in.
Aws192.png|The Coopers.
Sheldon and Amy married 3.png|Penny and Leonard watching the Coopers.
Sheldon and Amy married 2.png|Penny and Leonard following down the aisle.
A Docent, A Little Lady and a Bouncer Named Dalton.jpg|Getting her first period on the way to a baseball game.
Missy regrets sitting under the Hair-Dryer Chair.jpg|Missy as a child at a hair salon in Medford, Texas.
Sheldon rides a bike with Missy looking.webp|Helping his brother learn to ride a bicycle.
Missy and the school photographer.jpg|Missy wearing makeup for her 5th grade photoshoot.
Missy's entire face is her good side; So sayeth the Cooper Sister.jpg|According to Missy, her whole face is her good side now.
Missy 1985.jpg|Five-year-old Missy, before she tips over Sheldon's play table.
Missy 1982.jpg|Two-year-old Missy, eating a book.
Dolled-up Missy at the school photo shoot.jpg|
Missy Bad hair 1.png|Bad hair
Missy Bad hair 2.png|Bad hair
Missy Bad hair 3.png|Bad hair
==References==
es:Missy Cooper
Category:Female Characters
Category:Cooper Family
Category:Missy
Category:Mothers
Category:Twins
Category:Sisters
Category:Sheldon Cooper
Category:Young Sheldon
Category:Reference Materials
Category:Recurring Characters
Category:Season 1 Characters (The Big Bang Theory)
Category:Season 7 Characters (The Big Bang Theory)
Category:Season 11 Characters (The Big Bang Theory)
Category:Season 1 Characters (Young Sheldon)
Category:Season 2 Characters (Young Sheldon)
Category:Season 3 Characters (Young Sheldon)
Category:Season 4 Characters (Young Sheldon)
Category:Season 5 Characters (Young Sheldon)
Category:Season 6 Characters (Young Sheldon)
Category:Season 7 Characters (Young Sheldon)
Category:Young Sheldon Characters
Category:The Big Bang Theory Characters
Category:Georgie & Mandy's First Marriage Characters
Category:Amy's Family
Category:Married