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Howard smiles as he and Raj shop in Stuart's comic book store.
The Hot Tub Contamination
Season 10, Episode 5 - Aired October 17, 2016
When Sheldon and Amy start bickering over their living situation, Leonard and Penny step in to keep the pair separate and to give them advice on living with a significant other. Meanwhile, after Howard and Bernadette blow off a planned vacation, they observe a pair of unexpected guests in their hot tub.