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Stuart decides to organize a Halloween party at his comic book store so Raj decides to become the party planner. At the encouragement of Amy and Bernadette, Penny decides to take more effort to understand what Leonard does for a living, but ends up hooking up with him at his workplace. Meanwhile, Howard, who just got back from space cannot stop talking about his time in space by making multiple references about space, which annoys Bernadette. Sheldon and Amy face a conflict when they cannot agree on the costumes to wear to the Halloween party.