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'The Comic Book Store Regeneration' - Season 8, Episode 15
As they prepare for the reopening of Stuart's comic book store, the gang is at each other's throats. Howard is angry at Stuart for taking furniture from his mother, while Penny and Leonard are angry with Amy and Sheldon for running experiments on them. Meanwhile, Leonard and Raj think they see Firefly star Nathan Fillion at a restaurant.
Air Date: February 19, 2015.