Leonard has to deal with the fallout of disproving Sheldon’s new scientific discovery. Raj spends a week at Howard and Bernadette’s apartment.

After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.

Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a “woman” he can talk to without being drunk, in the form of Siri…

Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.

Sheldon becomes concerned when everybody begins to hang out at Raj’s apartment and discovers Leonard is the center of the group.

Penny’s criticism of Wolowitz’s romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

Sheldon creates a scientific procedure for making friends.

When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens…

After he’s humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

Shawn and Gus attend a Civil War reenactment rehearsal for the sheer pleasure of watching Lassiter have a nervous breakdown as he runs it. When a scripted death turns real…

Matt reveals his abilities to his wife. HRG confers with Mohinder. Now that she knows the truth, Claire tries to make sense of her life. Hiro seeks the sword that…

The discovery of the CEO of a toy company packaged with his toys gives Booth and Sweets access to the company’s headquarters as they search for the murderer. Elsewhere, Brennan…

Nancy decides that her family has seen enough gunslinging for a lifetime, so to lighten things up she takes them to a Montana fair. Andy and Silas enter a butter-eating…

When a blue moon causes amok at the same time the girls are assigned a new whitelighter, thanks to the Elder’s suspicion of Leo, trouble brews. Meanwhile, Agent Brody tells…