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When Sheldon can't get in to Comic Con, he decides to devise his own comic book convention on The Big Bang Theory.
Penny gets a big break at a full time acting job while Sheldon is forced to take time off on The Big Bang Theory.
When Penny's acting debut doesn't go as she hoped, she ends up asking Leonard an serious question about their relationship on The Big Bang Theory.
With Sheldon away, each of them wonders what their lives would be like if they'd never met him on The Big Bang Theory.
Leonard and Amy try to help Sheldon handle when one of his discoveries is disproved on The Big Bang Theory.
Sheldon protests when the rest of the gang wants to spend Thanksgiving with Mrs. Wolowitz on The Big Bang Theory.
When a past mistake comes to light, Sheldon makes Leonard pay by walking a mile in his shoes on The Big Bang Theory.
Sheldon seeks his revenge when his childhood idle Dr. Proton asks for Leonard's help with an experiment on The Big Bang Theory.
Sheldon worries that a major scientific breakthrough will follow him for the rest of his career, while Howard's grand romantic gesture affects other relationships on The Big Bang Theory.
Amy and Sheldon's relationship is put to the test when she takes a job at his university on The Big Bang Theory.