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.
Penny finally gets her big break, or does she? Her reaction leads her to make Leonard an offer that is difficult for him to accept. Sheldon tries to quantize humor while Raj and Stuart go to the mall to practice talking to girls.
Penny takes a drastic step to further her career. While Leonard says he supports her decision, he has his doubts. Sheldon is forced to take some vacation time and ends up hanging with Penny. While Amy fends off an unwanted suitor, Bernadette tries to find a replacement comic book she accidentally damaged.
The guys fail to get tickets to Comic-Con and debate whether to buy them from a scalper. Sheldon refuses to and decides to start his own comic book convention and he targets James Earl Jones as a potential panelist. While the guys are occupied with "childish" endeavors, the ladies decide to do something "grown-up".
Amy treats Sheldon to a train trip as incentive for a romantic Valentine's Day getaway. Raj leaves his dog in the not so capable hands of Penny and Leonard.
At Penny's urging, Leonard stands up to Sheldon and buys a dining room table while Howard and Bernadette contemplate a return to the space station for Howard.
Howard takes Bernadette's comments seriously about he and Sheldon's bickering and invites Sheldon to fly with him to NASA at Houston. Penny's career luck continues its downward slide while Raj asks Amy to be his wingman on an online dating service.
Sheldon decides to surprise his mother with a visit since he is already in Texas with Howard, but he is the one who gets the big surprise. Raj puts on another of his dinner parties that leads to some conflict within the group.
An episode about choices: Raj is faced with the possibility of dating two women; Penny must decide whether to take a role in a bad movie; Sheldon must choose between buying an X-Box One or PS4.
Special Guest Stars: Wil Wheaton
as Himself (Special Appearance By) |
Sheldon comes to the depressing realization that is life long research into string theory has been for naught. Howard and Bernadette join Raj and his new girlfriend Emily on a double date, which turns out to be a night Howard would just as soon forget.
When Sheldon tries to be spontaneous, it leads to unexpected friction between Penny, Amy and Bernadette. Meanwhile, Raj seeks Howard's help in preparing for a date with Emily.