Sheldon and Penny commiserate over their mutual sadness of Leonard's absence. Howard encourages Raj to start looking for another girlfriend and is surprised at who he chooses. Amy & Bernadette are away at a conference and bond/clash when they talk about their relationships.
Leonard arrives home early and chooses not to tell Sheldon. Howard's unusual behavior results from an unlikely source.
After the entire gang passes on Raj's dinner party, he designs a scavenger hunt that brings out unknown personality traits in his friends.
Sheldon looks to exact revenge from Amy after she ruins Raiders of The Lost Ark by revealing a plot hole. Leonard uses guilt as leverage over Penny, and Raj and Stuart try the Internet to find a date.
When Amy starts working at the same university as Sheldon, friction between the pair spreads to Howard and Bernadette.
Sheldon is insufferable after making a major scientific discovery, or did he? Howard plans an elaborate romantic celebration for Bernadette and Penny decides she needs to do something for Leonard.
A chance encounter with Professor Proton ends up hurting Sheldon's feelings when his childhood hero looks to Leonard for professional advice. Raj's special bonding time with the girls is hijacked by Howard.
Special Guest Stars: Bob Newhart
as Arthur (Professor Proton) |
Leonard uncovers a situation that he is sure will make Sheldon "freak-out", but Sheldon comes up with a compromise that ends up punishing Leonard. Penny encounters Raj's ex-girlfriend and can't help herself from intruding into his love life.
Howard invites everyone to his mother's house for Thanksgiving where unexpected drama emerges from Penny's past and Howard's father-in-law bonds with an unlikely person.
Sheldon's disgust at his accidental discovery and subsequent fame reach a level that compels Leonard and Amy to try to mollify him. Raj needs a temporary place to stay for a week so Howard invites him to stay with he and Bernadette.
Special Guest Stars: Wil Wheaton
as Himself (Special Appearance by) |
Co-Guest Stars: Ira Flatow
as Himself (as Ira Faltow)
Sheldon goes home to Texas to be with his family during the birth of his sister's baby and the gang reminisces about what their life would be life if they never met him.
When Penny's big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Sheldon tries to learn how to be funny and Raj tries to work on his "game" before talking to girls.