![The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--iQdBt3rU--/c_fill,h_315,w_851/d_tv-fanatic-placeholder-square.png,f_auto,fl_lossy,q_75/v1421782016/banner/the-big-bang-theory.jpg)
The Big Bang Theory
Thursdays 8:00 PM on CBSWatch The Big Bang Theory Season 3 Online
Watch The Big Bang Theory Season 3 full episodes online, free and paid options via our partners and affiliates.
![Big Bang Scene](https://tv-fanatic-res.cloudinary.com/iu/s--mdYLlM9e--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371160602/big-bang-scene.png)
Blossom alert! Former sitcom star Mayim Bialik guest stars on the season finale as a potential love interest for Sheldon.
![Nerdy Flashback](https://tv-fanatic-res.cloudinary.com/iu/s--WWu5fU-Q--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371163125/nerdy-flashback.png)
Leonard tells Penny the story of how the apartment elevator broke through a series of flashbacks.
![Judy Greer on Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--TE4qkxb5--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371160578/judy-greer-on-big-bang-theory.png)
Sheldon has a female physicist, Dr. Plimpton (Judy Greer) spend the night at the apartment.
![Back from Disney Land](https://tv-fanatic-res.cloudinary.com/iu/s--wL-kbsUy--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371158453/back-from-disney-land.png)
After Penny and Leonard break up, Sheldon goes behind Leonard's back to hang out with Penny.
![Nerd Bowl Off](https://tv-fanatic-res.cloudinary.com/iu/s--R6-mYPWk--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371156872/nerd-bowl-off.png)
Sheldon goes up against his nemesis, Wil Wheaton at the bowling alley while Leonard and Penny have their own fight.
![Sheldon Cooper, No Pants](https://tv-fanatic-res.cloudinary.com/iu/s--KnveWnRX--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371156843/sheldon-cooper-no-pants.png)
When Sheldon is forced to give an acceptance speech for an award he received, he must overcome his stage freight.
![Sheldon as Gollum](https://tv-fanatic-res.cloudinary.com/iu/s--M3dRFOeA--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371156563/sheldon-as-gollum.png)
When the guys buy a Lord of the Rings ring from a garage sale, they all begin to covet their precious.
![Stan Lee on The Big Bang Theory](https://tv-fanatic-res.cloudinary.com/iu/s--qCRd2AE0--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371156202/stan-lee-on-the-big-bang-theory.png)
Sheldon misses his chance to meet comic book creator Stan Lee when he's stuck in traffic court over a ticket that Penny got him.
![Leonard Gives Penny Swiss Hints](https://tv-fanatic-res.cloudinary.com/iu/s--Clu8XvqV--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371142102/leonard-gives-penny-swiss-hints.png)
When Leonard is giving a plus one to go to Switzerland to see the Large Hadron Collider on Valentine's Day, Sheldon tries to convince Leonard to take him over Penny.
![What's the Answer?!?](https://tv-fanatic-res.cloudinary.com/iu/s--__0R9FDl--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371141699/whats-the-answer.png)
Sheldon gets a job at the Cheesecake factory to help his solve a theory; Leonard and Wolowitz steal Raj's idea for a double date.
![Sheldon on a Ledge](https://tv-fanatic-res.cloudinary.com/iu/s--qbeoyfMv--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371141095/sheldon-on-a-ledge.png)
When Leonard and Sheldon's apartment gets robbed, their friends help them devise a security system.
![Raj and Abby Get Close](https://tv-fanatic-res.cloudinary.com/iu/s--HLUzECMT--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371135082/raj-and-abby-get-close.png)
Sheldon and Raj attend a university mixer where Raj meets Abby (Danica McKellar); Leonard is upset to find out that Penny believes in psychics.
![Beverly Hugs Leonard](https://tv-fanatic-res.cloudinary.com/iu/s--8fquRgZy--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371134942/beverly-hugs-leonard.png)
Leonard's mother, Beverly (Christine Baranski), is back and Leonard is upset to find out she's getting divorced and told Sheldon, not him.
![Wolowitz Gets Jealous](https://tv-fanatic-res.cloudinary.com/iu/s--PWHGht9V--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371134273/wolowitz-gets-jealous.png)
Penny seeks Sheldon's help to better understand Leonard's work; Wolowitz gets jealous when Leonard and Bernadette become friends.
![Wolowitz and Bernadette Kiss](https://tv-fanatic-res.cloudinary.com/iu/s--D4XFNRgK--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371134133/wolowitz-and-bernadette-kiss.png)
When Kripke embarrasses Sheldon on NPR, he swears revenge; Wolowitz is scared to commit to Bernadette.
![Camping with a Computer](https://tv-fanatic-res.cloudinary.com/iu/s--to40Yyb_--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371133680/camping-with-a-computer.png)
When Leonard, Raj and Wolowitz go camping, an injured Penny must rely on Sheldon for help.
![Sheldon Shows Off Board Game](https://tv-fanatic-res.cloudinary.com/iu/s--qlmblclV--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371133637/sheldon-shows-off-board-game.png)
When Penny's musician ex-boyfriend wants to crash on her couch, Leonard and Penny fight and Sheldon tries to stop them.
![Leonard in Football Jersey](https://tv-fanatic-res.cloudinary.com/iu/s--arKf3eCg--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371133425/leonard-in-football-jersey.png)
Leonard gets tutored in football by Sheldon; a kite flying mishap causes a fight between Wolowitz and Raj
![Penny Plays with the Boys](https://tv-fanatic-res.cloudinary.com/iu/s--VXfvFUwO--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371132846/penny-plays-with-the-boys.png)
Sheldon goes up again the Star Trek actor, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends
![Raj Works for Sheldon](https://tv-fanatic-res.cloudinary.com/iu/s--2E1pc1U_--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371132693/raj-works-for-sheldon.png)
Desperate to avoid going back to India, Raj considers a job working for Sheldon; Howard becomes a third wheel to Leonard and Penny
![Sheldon Uses Positive Reinforcement](https://tv-fanatic-res.cloudinary.com/iu/s--iowJ2VBh--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371132430/sheldon-uses-positive-reinforcement.png)
Howard takes Raj with him to the Goth dating scene; Sheldon uses chocolate as part of his behavioral experiment on Penny.
![The Boys Search for the Cricket](https://tv-fanatic-res.cloudinary.com/iu/s--8HnjS0PC--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371131451/the-boys-search-for-the-cricket.png)
Leonard and Penny try and make things not awkward after their hookup; Sheldon and Wolowitz bet their best comic books on a bet to determine the species of a cricket
![The Boys Come for Sheldon](https://tv-fanatic-res.cloudinary.com/iu/s--t_OSFW3t--/t_small_l/cs_srgb,d_tv-fanatic-placeholder-square.png,f_auto,fl_strip_profile.lossy,q_auto:420/v1371130625/the-boys-come-for-sheldon.png)
Sheldon runs to his mother when he learns the gang messed with her arctice expedition's data; the guys go chasing after him with Leonard sacrificing his chance with Penny.