Howard and Bernadette’s life gets complicated when Stuart (series regular KEVIN SUSSMAN) starts bringing his new girlfriend home. Meanwhile, Penny and Leonard talk about starting a new family, as Raj explores an arranged marriage.
When Sheldon won’t tell anyone why he’s never mentioned Tam (guest star ROBERT WU), his childhood best friend, Leonard takes matters into his own hands. Also, Bernadette and Penny take out Raj’s fiancée, Anu (guest star RATI GUPTA), for dinner to get all the details on her. JERRY O’CONNELL returns as Sheldon’s brother, George.
When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny’s Halloween party; Meanwhile, Leonard is shocked that Penny doesn't remember their first kiss.
Sheldon tries to bond with Amy’s father. But when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Meanwhile, Raj and Anu attempt to get physical.
Penny and Leonard organize a paintball game that results in mayhem, when Sheldon is jealous of Amy, Raj catches Anu with her ex-boyfriend, and Stuart doesn’t want to move in with Denise.
