Season 5

Season 5 of The Big Bang Theory returned to television in September 2011. The season ended in May 2012. In this season, Amy Farrah Fowler and Bernadette Rostenkowski become main characters with more screen time. 
The season is mainly focused on Howard and Bernadette's wedding, the end of Leonard's long-distance relationship with Priya, Leonard and Penny experimenting in dating again, and Sheldon officially becomes Amy's boyfriend.
==Cast==
=== Main Cast ===
*Johnny Galecki as Leonard Hofstadter (24/24)
*Jim Parsons as Sheldon Cooper (24/24)
*Kaley Cuoco as Penny (24/24)
*Simon Helberg as Howard Wolowitz (24/24)
*Kunal Nayyar as Rajesh Koothrappali (24/24)
*Mayim Bialik as Amy Farrah Fowler (21/24)
*Melissa Rauch as Bernadette Rostenkowski (22/24)
=== Recurring Cast ===
* Aarti Mann as Priya Koothrappali (2/24)
* Brian George as V. M. Koothrappali (3/24)
* Alice Amter as Mrs. Koothrappali (3/24)
* Carol Ann Susi as Debbie Wolowitz (8/24)
* Wil Wheaton as Himself (2/24)
* Kevin Sussman as Stuart Bloom (6/24)
* John Ross Bowie as Barry Kripke (3/24)
* Mike Massimino as Himself (2/24)
* Joshua Malina as President Siebert (2/24)
* Casey Sander as Mike Rostenkowski (2/24)
* Ian Scott Rudolph as Captain Sweatpants (2/24)
=== Guest Cast ===
* Christine Baranski as Beverly Hofstadter
* Laurie Metcalf as Mary Cooper
* Vernee Watson as Althea Davis
* Pasha D. Lychnikoff as Dimitri Rezinov
* Stephen Hawking as Himself
* Katie Leclerc as Emily
* Courtney Ford as Alice
* Blake Berris as Kevin
* Ashley Austin Morris as Laura
* Josh Brener as Dale
* Lance Barber as Jimmy Speckerman
* Jonathan Schmock as Jonathan
* Jim Turner as Reverend White
* Becky O'Donohue as Siri
* Lynn Philip Seibel as Robb Rothman
* Peter Onorati as Angelo
* Chriselle Almeida as Lakshmi Choudry
* Robert Clotworthy as Dave Roeger
* Amy Tolsky as Joan
* Brent Spiner as Himself
* Leonard Nimoy as Spock
==Episodes==
Episode (Series)	Episode (Season/Ep#)	Title 	Original Air Date 	Directed By 	Description
88 	501 	The Skank Reflex Analysis 	September 22, 2011	Mark Cendrowski	Penny is worried with how damaged her friendship with the guys will be in the aftermath of her one-night stand with Raj while Sheldon becomes the leader of the paintball team.
89 	502 	The Infestation Hypothesis 	September 22, 2011	Mark Cendrowski	A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.
90 	503 	The Pulled Groin Extrapolation 	September 29, 2011	Mark Cendrowski	Leonard accompanies Amy to a wedding. Meanwhile, Howard and Bernadette spend a weekend with Mrs. Wolowitz.
91 	504 	The Wiggly Finger Catalyst 	October 6, 2011 	Mark Cendrowski	Penny finds the perfect girl for Raj to date. Meanwhile, Sheldon uses Dungeons & Dragons dice to make life's trivial decisions.
92 	505 	The Russian Rocket Reaction 	October 13, 2011 	Mark Cendrowski	Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.
93 	506 	The Rhinitis Revelation 	October 20, 2011 	Howard Murray 	Sheldon competes with the gang for his mother's affection when she comes to visit.
94 	507 	The Good Guy Fluctuation 	October 27, 2011 	Mark Cendrowski	A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
95 	508 	The Isolation Permutation 	November 3, 2011 	Mark Cendrowski	Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.
96 	509 	The Ornithophobia Diffusion 	November 10, 2011 	Mark Cendrowski	Sheldon tries to cure his phobia of birds, while Leonard and Penny experiment with hanging out alone.
97 	510 	The Flaming Spittoon Acquisition	November 17, 2011 	Mark Cendrowski	When Stuart, from the comic book store, asks Amy out on a date, Sheldon becomes jealous and acts on their relationship.
98 	511 	The Speckerman Recurrence 	December 8, 2011 	Anthony Rich 	Leonard confronts his fears when he is contacted by a bully who tormented him in high school.
99 	512 	The Shiny Trinket Maneuver 	January 12, 2012 	Mark Cendrowski	Howard and Bernadette deal with the possibility of ever having a child, while Sheldon and Amy encounter the first bump in their relationship.
100 	513 	The Recombination Hypothesis 	January 19, 2012 	Mark Cendrowski	Leonard decides to invite Penny out on a dinner date, hoping to rekindle their relationship.
101 	514 	The Beta Test Initiation 	January 26, 2012 	Mark Cendrowski	Leonard and Penny deal with the possibility of a reconciliation and Raj finally finds a "woman" that he can talk to without being drunk; the Siri in his new iPhone. Meanwhile, Amy helps Sheldon start a new YouTube series called "Sheldon Cooper presents Fun with Flags".
102 	515 	The Friendship Contraction 	February 2, 2012 	Mark Cendrowski	Tired of being more like Sheldon's chauffeur than his roommate, Leonard invokes Clause 209 of The Roommate Agreement that allows him to be only an acquaintance. Meanwhile, Howard has been chosen by NASA to go into space and tries to get a neat nickname.
103 	516 	The Vacation Solution 	February 9, 2012 	Mark Cendrowski	Forced to undergo his mandatory vacation by President Siebert, Sheldon decides to join Amy at her laboratory, only to find himself struggling to do things right. Meanwhile, Bernadette and Howard face the issue of signing a prenuptial agreement, at her father's insistence.
104 	517 	The Rothman Disintegration 	February 16, 2012 	Mark Cendrowski	Sheldon and Kripke engage in sporting activities to battle each other out in order to find the winner of who will get the newly vacated Robb Rothman's office. Meanwhile, Penny feels uncomfortable with Amy's friendship gift.
105 	518 	The Werewolf Transformation 	February 23, 2012 	Mark Cendrowski	Sheldon's world turns upside-down when his barber gets sick. Meanwhile, astronaut training gets Howard to rethink his decision to join the upcoming mission to space.
106 	519 	The Weekend Vortex 	March 8, 2012 	Mark Cendrowski	Leonard plans a marathon video game event for the gang the same weekend Amy wants Sheldon to go to her aunt's birthday party.
107 	520 	The Transporter Malfunction 	March 29, 2012 	Mark Cendrowski	Sheldon opens his mint-condition vintage Star Trek transporter -- a gift from Penny which he ends up breaking. Meanwhile, Raj asks his parents to set him up with someone.
108 	521 	The Hawking Excitation 	April 5, 2012 	Mark Cendrowski	When Howard gets the opportunity to work with Stephen Hawking, Sheldon will do whatever it takes to meet him.
109 	522 	The Stag Convergence 	April 26, 2012 	Peter Chakos 	The guys organize a bachelor's party for Howard, which leads to the unraveling of Howard's secrets. Bernadette accidentally hears about them, threatening their impending nuptials.
110 	523 	The Launch Acceleration 	May 3, 2012 	Mark Cendrowski	Howard's launch date gets pushed up, coinciding on the same week as his wedding, putting him in a dilemma. Leonard endangers his relationship with Penny with a sudden proposal to her, and Sheldon finds himself developing feelings for Amy after a few gestures from her.
111 	524 	The Countdown Reflection 	May 10, 2012 	Mark Cendrowski	Howard and Bernadette decide to elope after their wedding is put off to enable Howard to join NASA's mission to the International Space Station.
__NOEDITSECTION__
 Season 05
Category:Seasons
 
Category:Sheldon Cooper
Category:Penny
Category:Leonard Hofstadter
Category:Howard Wolowitz
Category:Rajesh Koothrappali
Category:Bernadette Rostenkowski-Wolowitz
Category:Amy Farrah Fowler
Category:Stuart
Category:Priya Koothrappali
Category:Leonard and Priya
Category:Shamy
Category:Mrs. Wolowitz
Category:Mike Rostenkowski
Category:Nurse Althea
Category:Alice
de:Staffel 5
es:Quinta temporada
it:Quinta stagione
pt-br:5ª temporada