In the fourth-season finale, Raj moves in with Sheldon when Leonard and Priya’s “Star Trek” bedroom fantasy is too much for him; and the guys tease Howard when Bernadette gets her PhD, making Howard the only one without a doctorate
Howard finally tells his mother that he’s marrying Bernadette, and the news puts her in the hospital.
Raj makes an attempt to cure his phobia of talking to women; and Penny spies on Leonard and Priya with the help of Bernadette.
Priya uses her legal expertise to rip apart Sheldon’s roommate agreement, and the women take the flustered Sheldon out dancing
Sheldon and Amy spread gossip as part of an experiment; and Howard and Bernadette’s relationship gets serious. Physicist Brian Greene has a cameo
The guys become sleuths to find out who hacked Sheldon’s online-game account
Leonard is forced to choose between Penny and his new girlfriend, Priya; Howard’s magic trick drives Sheldon crazy.
Sheldon is upset when he realizes Leonard is the center of their group of friends.
Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj’s sister rekindle their relationship.
A wealthy donor makes Leonard question what he is willing to do for science.