Leo Dooley

This article is about Leo's original self. or his alternate universe counterpart, see Leo Dooley (Parallel Universe). For his future self from an alternate 2019, see Leo Dooley (Alternate Future)
Leo Francis Dooley is the main protagonist of Disney XD's 2012-2016 comedy television series Lab Rats. He was the only son and eldest child of Tasha, the older half-brother of Naomi, the step-son and second-youngest child of Donald, the younger step-brother/cousin and best friends with Adam, Bree, and Chase, the step-cousin of Daniel and Marcus and step-nephew of Douglas. Loyal, caring and intelligent, Leo is initially an outcast until he meets his step-siblings, Adam, Bree and Chase and grows up. His stepfather, Donald had a lack of trust for Leo due to his tendency to accidentally destroy things, but has started to change his opinion, as he made Leo the team's "Mission Specialist."
Midway to Season 3, Leo becomes bionic after Douglas installs them to save his arm after it was crushed by a ceiling beam caused by Taylor when she blasted it on top of him and Donald put bionics in Leo's leg after it was crushed by a space elevator while saving his step-father.
==Biography==
===Season 1===
===Season 2===
===Season 3===
===Season 4===
==Personality==
Being a teenager in high school, Leo is still trying to find his place in it and in the world. At the beginning of the series, he was in still in his clumsy phase. However, Leo can be arrogant at times, though not as much as his stepfather, Donald.He is very close with his family and will do anything to protect them, as he went the distance to save the Lab Rats from dying in the future and his willingness to prove that Marcus and his father were evil and up to something. He could also be a rebellious teenager like he's mother Tasha was when she was younger and often disobeying his father Donald or his uncle Douglas.
In Season 3, Leo had begun maturing, and inventing things without breaking Donald's things, such as inventing orbs that he invented so they could protect Adam, Bree, and Chase from Douglas and Krane. Though the orbs went haywire, but Donald admitted Leo had a good concept going on. It is shown at this point, Leo was also willing to put the past behind himself and his enemies if they show change, as he did with Douglas in "Taken" and Taylor (S-1) in "One of Us." He willingly listened to what Douglas had to say about Victor Krane and agreed to a fresh start with Taylor, eventually becoming friends with both them.
Despite not having super intelligence like Chase, Leo was quite intelligent teenager and was mentioned being the smart kid in school in the episode's premiere, mentioning it's not easy for him to Chase and the other Lab Rats. He is also quite intelligent, shown that he never liked Marcus even before it was revealed that Marcus was evil. Leo could also come up with plans for the missions, eventually becoming the team's strategic mission specialist. Like his brother Chase, Leo will sometimes remind people of the bigger picture, shown at least twice. The first time he reminded his siblings that they had to save Donald during the jet wing incident because he did the stupid stunt to give them the Lab back, causing Bree to realize their brother was right. Another time happened in "Which Father Knows Best?" where Leo told Douglas to get past his rivalry with his brother after Leo told him Donald couldn't fix Bree's chip when she broke it because Bree was more important. Additionally, Leo scolded his siblings for causing a blackout and fighting in "Rise of the Secret Soldiers." He also easily deduced that Douglas was behind cyberhacking Donald back when he was evil. Characters such as Douglas has said that Leo is a smart kid ever since the Marcus incident.
Ever since his mother married Donald, Leo remained supportive of her decision. After meeting his siblings, he wanted to become bionic like them, dropping hints to Donald. However, Douglas later gave Leo bionics to save his arm. The boy was excited but reckless with his bionics, something that caused Leo to connect Daniel with. Like his uncle and brother, Leo felt overshadowed by his older siblings, similar to how Chase felt when Adam and Bree are praised more than him in "Avalanche" and how Douglas felt with Donald all of his life. This is shown in "Lab Rats: On the Edge," where he expresses hope that his siblings don't see him as just their little brother. After saving Chase and taking charge, Donald realizes Leo is ready and levels him up to mentor, where Chase tells Leo he is proud of his little brother. He also expressed hope to Bree and Chase that he would see his brother and sister again.
==Abilities==
====Bionic Abilities====
*Bionic Arm: After Leo's arm was crushed by a ceiling beam caused by Taylor when she was known as S-1, Douglas Davenport healed it with bionic components after learning his stepnephew would never be able to use his arm again. It have him secret abilities so Leo could have a defense skill. 
**Super Strength: Leo has strength in his arm similar to his stepbrother, Adam Davenport, being able to lift a couch with his one arm and punch a dent in the wall. However, he is not strong enough to hold the space elevator for long.
**Laser Sphere Generation: Douglas gave Leo the ability to generate laser spheres in his hand. It is Leo's primary ability, and he uses it to knock out dangerous opponents, such as Victor Krane and Taylor (S-1)
***EMP Generation: Combined with Taylor's abilities, Leo and Taylor can create an EMP generation that can take out anything. The first time they did it blew out the electricity on Bionic Island and when they did it a second time, Leo accidentally caused her to go permanently blind. A third time, they were able to use the EMP ability to take out the safety lock that kept Donald and Leo's entire family locked in their self-driving car.
**Energy Transference:, Douglas unlocked this ability for Leo during the Battle of the Bionic Soldiers. It allows him to absorb energy from another source of power. He can also use it in Battle, as he used it to take out Taylor back when she was only S-1 by absorbing her attack and then redirecting it back. Leo used it to stop a space elevator
*Super Durability: Leo's bionic arm and leg are more durable than his non-bionic limbs. For example, when he attempted to punch a hole in the wall during The Vanishing, he showed no pain in putting a dent in the wall not when he kicked Eddy with his Bionic leg.
*Two Simultaneous Abilities: when stopping an accelerated space elevator while supposedly saving his father, Leo used his super strength to stop the elevator and absorbed the kinetic energy to slow it down.
*Bionic Leg: Leo was given a bionic one by Donald after his original was crushed by a space elevator. It is more powerful than his bionic arm, being able to cut through the metal cage he, his siblings and the students were trapped in.
**Super Kick: Leo's leg can kick pretty far, as he was able to kick Adam's baseball and kick Eddy up into the air. His kick was able to break through a wall.
===Non-Bionic Abilities===
*Leadership/Expert Tactician: Despite being irresponsible at first, throughout the years, Leo became a capable leader. Chase tells Tasha that Leo knows how to remain calm in dangerous situations and take control whenever they are on missions. This is shown in the episode Forbidden Hero, where Leo directed Adam on rescuing his mother. In Lab Rats: On the Edge, Leo mananged to lead Logan and Taylor in rescuing his family. He directed Taylor with creating their EMP Generation ability and then use Logan's Energy Manipulation ability to direct the EMP to a device that was keeping Leo's family locked in the self-driving limo. Because of his leadership, Donald promoted Leo to mentor and Chase acknowledged that Leo was meant to be a hero.
*Martial Arts: It is shown that Leo can use martial arts like the Lab Rats, though it seems he can only use martial arts when he was bionic. Most of the time he uses his quick wit to get out of dangerous situations and enemies. He attempted to fight Douglas in Taken but couldn't due to Douglas being the better fighter.
*Skilled Fire-Staff Fighter: In Alien Gladiators, he is seen beating many competitors in the competition even the most skilled ones. He is a formidable fire-staff warrior and even defeated Donald Davenport, who is very skilled in martial arts, weaponry, and fire-staff, itself. To be fair, Leo only won against his father because his back gave out. However, he managed to defeat principal Perry
*Bravery: Leo is very brave, even facing Marcus by himself and an attemt to fight Douglas. He also stood up against Krane and Taylor despite them being more dangerous than any enemy Leo and his family faced, as he quickly backed down when Krane threatened to hurt him. He fought in the Bionic War and goes on mission to save people. He even underwent a rescue to save his mother with Adam when a category five storm nearly blowing her out to sea.
*Peak Level Marksman: Leo is said to be a terrible shot, especially in the Episode You Posted What!?! where Leo stated he had poor coordination. He was able to accidentally hit a metal barrel off its stand and hit Krane spot on the head though he was not intending to hit them with his arm. However, when Leo was training with Douglas, he managed to hit at target board three times in a row. His aim was off when he had to harpoon a spider but couldn't do it until Bree took over. However, Leo's aim seemed to have improved through training, and because he was able to fire at the liquid Bionic serum without much trouble.
*Peak-Level Intellect: Leo has Intelligence that is above average but not as much as Chase's and it said he excels in technology and science in several aspects after spending time in the lab. Characters such as Douglas and Chase have even acknowledged Leo has been smart but doesn't have input on biology when they were reanimated a dead spider. He also helped Donald lay out the team's mission and come up with quick solutions. He also knew who Marcus truly was before his true colors were revealed to him. However, he could not trace any of the IP addresses Donald supplied him with because Douglas layered them and ended up dead-end after dead end. However, he realized digital was the one who hacked into Davenport Industries and stole all the money and in Season 3, Leo could also realize Krane was behind the bionic secret getting exposed with Douglas.
==Possessions==
*Exoskeleton: Leo once went in his step-father's Exoskeleton to demonstrate it but Chase messed with it out of jealousy that Donald was paying more attention to Leo than him.  He later used it when storming into Douglas' lair.
*Mission Suit: Leo got one in "Rise of the Secret Soldiers" arc. Leo's is different than Adam, Bree and Chase's in terms of style. It is able to withstand any harshness of climate or temperature.
==Glitches==
*Super Strength Unawareness: Though his super strength cannot glitch, Leo sometimes remains unaware that he is using his bionic strength, lifting one of the couches in his living room when he was looking for his smart phone.
*Bionic Sleepwalking: Because Leo's arm was not calibrated properly into his nervous system without a capsule, it caused Leo to sleep walk while using his laser sphere ability. However, Douglas gave Leo an arm capsule to stop this from happening.
*Uncontrollable Laser Spheres: Sometimes, Leo cannot have control of his laser spheres, as they set off uncontrollably when he is sleepwalking. They usually activate uncontrollably when Leo is excited (as he nearly set Douglas' hair on fire), panicking nearly burned Janelle alive, or irritated (by a fly, Leo's laser sphere blasted).
*Arrogance: Leo will sometimes show arrogance but at the end of the day, he usually learns that it takes more than recognition to be a hero.
==Relationships==
===Chase Davenport (Adoptive Brother)===
Chase is Leo's cousin/step-brother and Leo appears to be closer to Chase than the rest of his siblings. This is most likely due to the fact that both Leo and Chase are the youngest members of their family and are often teased by their older siblings. They often hang out together and finally formed a deep bond and relationship in "Robot Fight Club" when they win the Robot Throwdown against their mutual rival, Kevin Stone. Leo was also the only one able to snap Chase out of the Triton App by reminding his brother of the good times they had together. Despite their closeness, Leo often teases Chase but not as much as Adam does.
Their relationship was temporarily strained in "Lab Rats: On the Edge," when Leo felt overshadowed by Chase and his siblings. However, the brothers reconciled when Leo saved Chase from falling over the edge, and Chase revealed he couldn't have been any prouder.
===Bree Davenport (Adoptive Sister)===
Bree is Leo's older step-sister/step-cousin, and they first met in "Crush, Chop, and Burn," where Leo accidentally stumbled upon her and her brothers. He was the first one to show Bree the real world and how to be a teenage girl. Bree makes it her responsibility as Leo's older sister to see her younger brother following the right path, as she told him to take the blame and tell Perry he cheated off of Bree on her test (Spy Fly). Like Adam and Chase, Bree can be protective of Leo, as she shouted at Douglas to leave her brother alone when he came to rescue them and was concerned whenever Leo gets hurt (You Posted What, Space Elevator) and trapped in the training room with the rest of the bionic soldiers. She also regretted not believing Leo that Marcus was evil. (Bionic Showdown)
Leo tried everything to restore Bree's chip, even going to Douglas, the man who originally created it, to help them.
===Adam Davenport===
Out of all their siblings, Leo and Adam appear to be the least close, but they care about each other as brothers. They first met in "Crush, Chop and Burn" when Leo accidentally discovered Donald's lab. In the show, Leo will sometimes get annoyed with Adam's stupidity and out of the two of them, Leo appears to be more responsible. Despite this, Adam loves Leo as much as he does his other siblings and will be protective over him, as one of Adam's hidden abilities showed up when he saw Marcus about to kill Leo again. They hang out together, such as "Adam Up." Adam also worried for Leo when his arm got crushed by Taylor and Adam drove the protesters (including Principal Perry) away from Leo with his breath ability. He was proud of his younger brother when he went on his first official mission with them.
Currently, Leo and Adam are running what is left of the Bionic Academy, allowing room for them to grow closer. (
===Donald Davenport (Step-Father)===
Donald is Leo's stepfather and has been since 2012. Since Leo's biological father is never mentioned, Leo appears to be close to Donald as his father-figure. Donald tries too hard to bond with Leo, and once blew it with him when Donald revealed to Tasha Leo's secret crush when Leo wanted the secret kept between them. (Can I Borrow the Helicopter?)
Leo mainly calls him "Big D" because of his position as head of the Davenport Household. However, Leo doesn't have the best relationship with him, even admitting he's not all that good. At the time of season 2 Leo and Donald appeared to get along better, as Donald begins trusting him with missions and being a part of the team (Missing' the Mission). He is fairly protective of Leo as much as the Lab Rats, as he shouted for Douglas to leave his son alone and also regretted not believing Leo when he tried warning then Marcus was evil. However, Donald was relieved to see his son alive when Leo came in the middle of the battle between the Team and Douglas and Marcus Davenport. (Bionic Showdown)
Since Leo matured, Donald finally trusts his stepson, like allowing him to invent things in the lab without Donald in the room and allowing him to find sponsors for his J-Wing stunt (The Jet Wing). 
===Tasha Davenport (Mother)===
Leo and Tasha are very close and have a strong mother-son bond due to their similar personalities. The premiere episode implied they had already been living in Mission Creek prior to Tasha marrying Donald. Leo supports their marriage but it is revealed in Crush, Chop and Burn that Leo told his mother to stay away from online dating when they meet Adam, Bree and Chase for the first time and he sometimes wonders how they ended up together (Sink or Swim).
When Leo received bionic implants, Tasha was initially furious, but mainly with Douglas, (You Posted What?) and she often berates Douglas or Donald if Leo's bionics go haywire (Bionic Houseparty). She has chosen to support Leo for her son's sake. She was also worried about Leo whenever he is hurt or injured. In You Posted What, she came to the hospital in a hurry, quickly asking about her son's fate and immediately panicked when she saw Leo was missing. She also came to the island in Forbidden Hero when he was injured and took him off the team in fear for her son's safety. However, after seeing Leo take charge during the situation and learning from Chase that Leo does that on missions, she lets him stay. 
===Naomi Davenport (Half-Sister)===
When Tasha revealed she was pregnant with her and Donald's first child, Leo was happy for his mother and gave her a hug, promising to protect his sister after she was born. (The Vanishing)
===Douglas Davenport (Step-Uncle)===
Douglas is the brother of Leo's step-father, Donald, thus making Douglas his step-uncle. They were bitter enemies, but at the time, Leo did not know of his relation to Douglas until "Bionic Showdown. "However, Douglas went to Leo for help about Krane and despite his past feelings, Leo decided to listen. Leo's the first to believe Douglas, who tells Leo that he must talk to Donald. By the second half of season 3, Leo and Douglas were close enough for the latter to give Leo a bionic arm to replace his broken one 
===Daniel Davenport (Student/Step-cousin)===
Daniel is Leo's younger step-cousin. Ever since Douglas introduced Daniel to the Academy, Leo could relate to Daniel a lot, as he shared much of Leo's same experiences of feeling wanted in his family, and was reckless with his bionics much like Leo was when he first received his bionics. Daniel was glad to make Leo and his siblings' acquaintances, mainly because Daniel was glad to have more family members Leo and Daniel grew closer because of their many similarities, as Leo told his cousin to give Douglas a chance. Daniel eventually became one of Leo's students, and he continued to teach him how to properly control his bionics.
===Janelle (Girlfriend)===
Janelle is Leo's primary love interest in the series through Season 1 to 3 and season 4. He developed a crush on her sometime after his crush on Danielle, recounting that he and Janelle met when he accidentally wandered into the girls' bathroom. Leo confided to Donald about his romantic feelings for her and tried being flashy for Janelle because he was nerdy. When she shows up at the door because Tasha invited her, Leo tried to act cool around her but in truth, Leo did not want Janelle there but was not saying it to be mean. Following this, Leo failed to impress her until he borrowed his stepfather's helicopter and took Janelle out on a flight. She was finally starting to develop a crush on Leo. In "Air Leo," Janelle tells Leo that even though he did not win the one-on-one tourney against Trent, she was still glad that he tried his hardest, despite initially thinking Leo couldn't stand a chance against him. In "Back from the Future," Janelle invites Leo to a movie and in the same Episode, Leo learns from his future self that he and Janelle will one day marry each other. However, Leo misses the date that was supposed to bring them closer together, as Leo chose to save his siblings over going on the date with Janelle. He tells her the truth the next day but Janelle writes him off and walks away. However, the two seemed to have reconciled, since in "Avalanche," Janelle came over to Leo's house and revealed she liked coming over to the Davenport Household because she liked Leo for the he was rather than the things he owned, rather inventions that Leo stole from his stepfather. However, he accidentally freezes her with Donald's new freeze ray. Despite this, Janelle comes back to Leo's house to watch a movie with him. When Rose comes to visit, she does everything she can to get rid of Janelle by tormenting her and being rude to her. Janelle tried being nice to Grandma Rose for Leo's sake but got fed up when Rose continued being rude to her. Leo wished his grandmother would back down because he wanted to spend time with Janelle, who felt the same way. It took a while for him to get rid of his grandmother but Leo was able to continue his relationship with Janelle.
By season 3, Janelle considered Leo bad luck due to past incidents, such as recounting him freezing her with Donald's freeze ray. However, she invited him to her play and Leo decided to support her (Janelle was previously upset that he apparently hated the idea of coming but Leo accepted it. She was later angry when Leo's defense orbs came and he inadvertently ruined her play. After the world found out Leo's siblings were bionic, Janelle was impressed with Adam, causing Leo to grow jealous. When he tried showing her his bionics, Leo found that he couldn't (because of Douglas deactivating his bionics) and Janelle did not believe him. When Leo reactivated his bionics, he nearly killed Janelle with his laser sphere but proved he was telling the truth.
At the end of season 3 Leo shows her the bionic Academy by getting past Chase; Leo tries impressing Janelle but Spin, one of the students there, pretends to get hurt by Leo's laser sphere generation and make Leo look bad. However, Spin is eventually busted. In Season 4, it is revealed that Leo and Janelle are still dating despite the incident with Spin in her last appearance. She wanted to spend more time with Leo due to his duties on the island and threatened to break up with him if he did not visit her on the mainland once in a while.
It is revealed in "One of Us" that they are dating but not boyfriend and girlfriend
===Danielle (ex-crush)===
Danielle was the name of a girl that Leo had a crush on in the episode "Leo's Jam." He has in love with her so much that he would often act as a footstool for her two-layer feed on instead of the ground and sent her at least 87 e-mails. Additionally, she doesn't remember Leo's name and calls him Lenny. However, both Adam and Chase also fought over Danielle as she kept turning her attention to each of the three Dooley-Davenport brothers and at the dance, Leo won Danielle over with a dance he performed with his aunt and her book club. However, Leo realizes what he did was wrong to his brothers and apologize to them. Danielle is never seen nor mentioned again afterward and since Leo has a crush on Janelle, he no longer has a crush on Danielle.
===Shelley (Ex-Crush)===
Shelly was the name of a Droid phone that Leo had an unhealthy crush on in "Bionic Dog." Bree found this disturbing and pointed out that it was wrong for Leo to have a crush on an inanimate object. As soon as Bree changed the phone settings to Liam, a phone with a British accent, the two siblings fought over it. At the end of the episode, Otis urinates on it, passing both Leo and Bree to lose their interest on the phone.
===Taylor (Best Friend)===
Taylor and Leo used to be mortal enemies, and she tried to kill him at least twice and she was the main reason that Leo's arm was permanently damaged and why Douglas had to fix it with bionics. He later battled her in "Rise of the Secret Soldiers," where Leo managed to finally overpower her. However, because she was under the Triton App, Taylor did not recall Leo because she was a blank slate like all the other soldiers, meaning her actions of crushing Leo's arm was not of her own accord. Taylor met him again in "One of Us," where Leo knocked her out because he thought she was a threat to his friends. However, the two decided to forget move on in the past and finally, they became friends.
The two became extremely close, afterwards, and discovered a new ability. By joining their hands, they could make a laser sphere so powerful it could knock out all the lights in the Academy. However, this new power caused Leo to accidentally disable Taylor and make her go permanently blind. Despite it being an accident, Leo quit the Bionic Academy and was haunted by what he had done to Taylor. However, Taylor did not blame Leo because it was just an accident. She later called Leo when his family was in danger, as they were trapped in a self-driving car and together, the two managed to save Leo's family by disabling the safety lock device on Davenport's limo, where Taylor told Leo that blinding her was only an accident
===Logan (Best Friend)===
One of Leo's closest friends, Logan idolizes Leo and sees him as his hero. Logan respects his idol because Leo was an ordinary kid who became bionic. He supported Leo and became a part of his team when he wanted to compete against his siblings. After Taylor was hurt, Leo blamed himself and told Logan that he deserved a better leader for the team and left the Bionic Academy. However, he stayed behind with Leo and Taylor and helped him free his family from the Davenport self-driving limousine. After Leo came back, Logan hugged both Leo and Taylor, claiming to love them.
===Bob (Good Friend)===
Leo seems to get along with Bob. Like he did with Adam, he sometimes gets annoyed with Bob's stupidity or laziness. When Spin goes to call Leo for help, Bob happily tells his brother to tell Leo that he (Bob) said "hi." However, Leo appears to enjoy teasing Bob at times, because in that same scene, Leo joked with Spin and Bob, taking a selfie with the two to prove how ridiculous they looked. He scolded Bob and Spin for deleting the mission and going on it on their own and despite teasing them about getting stuck in quicksand, Leo was able to pull them out while lifting a log with his bionic arm, thus saving the duo. However, Bob got himself stuck in the quicksand again and Spin asked if they could just leave him there, with Leo considering it.
===Other Relatives===
====Rose (Grandmother)====
Leo is very close with his grandmother, but there are times when she gets in the way of his relationship with Janelle because she is a tad overprotective of her grandson.
====Janice (Maternal Aunt)====
Janice is the sister of Leo's mother Tasha, therefore his maternal aunt. It is implied the two have a healthy relationship because she helped him perform a dance in front of the girl, he liked with her book club.
====Other Relatives====
On the show, Leo's father is never mentioned in the series at all, so it is unknown what their relationship was like and what happened to him. According to Bionic Showdown, Leo's step-grandmother, Grandma Davenport, tends to never stop calling her family. Douglas later mentions his and Donald's father, Leo's step-grandfather, who Douglas at least 20 bucks from. Additionally, Leo has another aunt who is Tasha's other sister and a grandfather is mentioned in Three Minus Bree, where Leo mentions that Eddy may have inadvertently caused his grandparents to break up with each other. However, it is unknown if he is referring to Rose and Tasha's father or if he is referring to his stepfather's parents.
===Marcus Davenport (Arch-enemy)===
Marcus was an Android created by Donald's brother Douglas, therefore Leo's step-cousin. While Adam Bree and Chase were convinced that Marcus was a nice and troubled boy, his act does not fool Leo Dooley, who was the only one to dislike Marcus even before he knew they were family. Marcus framed Leo for breaking his guitar and later, even he was exposed, Marcus revealed his true colors to Leo afterwards threatening him if he ever tried busting him again. Overtime, Marcus came to hate Leo, who mutually hated him back. In Speed Trapped, Marcus tried having Leo killed by imprisoning him in Donald's self-driving car and when he was saved by the Lab rats, Leo learned that Marcus was bionic just like his siblings. Marcus threatened to reveal his siblings' secret to the authorities and therefore Leo's father would be sent to prison and Adam, Bree, and Chase would be taken away by the government.
Leo tried keeping Adam, Bree and Chase away from Marcus, and even risks his life to expose Marcus to protect his family and later, Leo manages to outsmart Marcus by having the robot Marcus apprehended Leo with by pretending to shake his hand, only to lick his hand, remembering how Chase managed to defeat Adam in an arm-wrestling match. With Marcus distracted, Leo was able to escape but the evidence he had against Marcus was ruined when Leo's phone fell through Davenport's latest teleportation device. After Marcus and Douglas kidnapped Donald and trapped the Lab Rats in a bionic blocking cage, Leo was forced to save his family but was confronted by Marcus, who had every intention of killing him after being told by Douglas to do so. However, Leo managed to outsmart him yet again, this time by hiring a protective vest that his father created. Marcus was upset to learn that Leo had survived when he came crashing down in Donald's exoskeleton creation. Marcus tried to kill Leo yet again until Marcus intervened to protect his younger brother by locking his new ability and blasting Marcus away from Leo. Marcus was later killed by a pile of rubble, ending Marcus' threat to Leo for the time being.
===Victor Krane===
An enemy Leo first encountered when Krane abducted him and his mother to get Donald to release Bree, Adam and Chase, Leo and Tasha were nearly killed by this madman. He later confronted Leo and Douglas at the high school. Krane is also indirectly responsible for damaging Leo's arm because he had S-1 attempt to crush Leo with a ceiling beam to keep him and his family out of the way. However, when that failed, Krane tries to get rid of Leo and Douglas again, and was surprised when he learned Douglas gave his friend bionics to heal his arm, failing to kill Leo at least three times. During "Rise of the Secret Soldiers," Krane brutally injured Leo's father, Donald, however, he left Leo unharmed as he races to his critically injured step-father. This enemy was later defeated by Leo's siblings when they combined their bionics. Leo, like everyone else, thought Krane to be dead until "Space Colony," where Krane was revealed to be alive, and wished to fight against Krane when he put his parents under the Triton App. This time, Krane died for real in Davenportia by Chase's hand. According to Donald Krane tried killing Leo at least three times (Sink or Swim, Taken, You Posted What!?!)
===Giselle Vickers===
Being the brother of Adam, Bree and Chase and Douglas' nephew, Giselle sees Leo as an enemy by association. Prior to her betrayal, Leo was a major fan of her films. He tries impressing her when Leo first meets her to get a character inspired by him to appear in her movie Bionic Action Hero, even interrupting his uncle's date with her. When it's revealed she is evil, Leo loses his respect for her especially since she tried to kill the Davenport family and kidnapped Chase to get his intelligence. In the finale, Giselle mocks Leo for being bionic in the arm and the leg. However, she underestimated the kids because Leo was the only one who could break from Giselle's cage (which blocked the Bionic Teenagers' bionic abilities but Leo because he did not have a chip.) She had no qualms to harming Leo, his siblings or his newfound cousin, Daniel, despite them being children, as Giselle wanted to watch Douglas and Donald suffer as she harmed their children.
==Etymology==
* Leo is a Latin given name. It is usually a masculine given name and it comes from the Latin word leo which in turns comes from the Greek word λέων meaning "lion".
* The name Francis is a unisex name. English form of the Late Latin name Franciscus meaning "Frenchman", ultimately from the Germanic tribe of the Frank people. 
* The name Dooley is a boy's name of Irish origin meaning "dark hero". Dooley is an Anglicized form of the Gaelic O Dublaoich, "descenddant of Dubhlaoch. Dooley Name Meaning & Dooley Family History at Ancestry
==Trivia==
*Leo was the shortest member of the family, the only normal kid and the youngest (younger than even Chase).
**He is now the second-tallest, a bionic teenager since the Season 3 Episode, "You Posted What?" and second-youngest since the discovery of his cousin, Daniel ("And Then There Were Four").
*In the beginning of the series, Leo was thirteen years old.
*Leo's outfit in the episode "Can I Borrow the Helicopter?" is the same one from his promotional images from season 1. His outfit in the episode "Missin' the Mission" is the same one from his promotional images of season 2
**He turned fourteen in "Bionic Birthday Fail"
**He is sixteen by season 3. (Three Minus Bree) and the beginning of season 4 ("Under Siege").
**He is (presumably) seventeen by the series finale.
*He was Tasha's only biological child until the birth of her daughter and Leo's sister Naomi. (Lab Rats: Elite Force)
*Leo shares some similarities with his brother, Chase:
**They are the youngest members of the four main siblings.
**They are often teased by Adam and Bree, however, they both get along better with Bree than they do with Adam, who also teases them about their height.
**At one point, they also snuck Douglas into Davenport's lab. (however, Chase lured him there and Leo brought him to the lab to fix Bree's chip.
**Anti-social and both mocked for their intelligence. (Leo mentioned how hard it is being the smart kid in school)
**They often feel overshadowed by their older siblings (Chase gets hurt by the lack of respect his team has for his intelligence, and Leo feels inferior to Adam, Bree, and Chase because they are all bionic humans, and later, because they doubt he has it in then to be more than being the youngest).
**They also get annoyed by Davenport's big ego, because whenever Donald tries to improve something, he always lets his big ego get in the middle while he tries improving his younger sons' lives.
**Leo also shares some similarities with his cousin, Daniel:
***They lived their whole lives without bionics.
***Excited but feeling lost when in their family, the Davenports.
***They get reckless with their bionics when they first got them.
***They later became mentor and student.
*Leo went on his first mission in "Rise of the Secret Soldiers" and got his first mission suit in the same episode of the same name.
*Leo grew taller in between Season 2 and 3 and his voice deepened
*According to Donald, he cannot handle high fiber cereal.
*Douglas implies he left a pen in Leo's bionic arm.
*On Adam's website, it says he's the 8 year old mascot called Leo Clooney (Rise of the Secret Soldiers).
*According to Douglas Donald killed most (if not all) of Leo's pets.  
*He was the only main character that wasn't originally a mentor at The Davenport Bionic Academy, he was a student. (First Day of Bionic Academy). He did eventually become one in "Lab Rats: On the Edge."
*Leo's the one who grew up the most of all his siblings. His voice deepened in Season 3 and he grew taller than Bree and around the same as Chase around the season as well.
*Season 3 has a subplot about Leo becoming bionic. The episode "Parallel Universe" foreshadows him becoming bionic (anepisode in Season 2) and the beginning where Perry tells the students, "Get to class before they shoot missiles from [Bree, Adam and Chase's] fingers]" in "You Posted What?"foreshadows Leo being able to shoot laser spheres from his fingers.
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