Sheldon stumbles upon a major scientific breakthrough, causing him to feel like a fraud, while Penny steps up her game with Leonard after seeing Howard make a romantic gesture to Bernadette.
Sheldon re-evaluates the time he spends with Amy when she takes a job at the university. Meanwhile, Howard is forced to sleep on his friend's sofa after he gets into an argument with Bernadette.
Sheldon introduces Amy to Raiders of the Lost Ark - one of his favourite films - and is distraught when she ends up pointing out a plot hole that ruins the whole story. Meanwhile, Leonard realises he can manipulate Penny into feeling sorry for him when his mother publishes a reveal-all book about his childhood problems.