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The gang deals with the actions of Raj and Penny from last season's finale.
Penny can't believe she slept with Raj, while Raj wants to go on a date with her.
Penny goes to stay with Amy to avoid seeing Leonard.
Howard finds out about Raj's song to Bernadette.
The guys play paintball and Sheldon sacrifices himself to inspire the team to win.
Raj confesses that he didn't actually have sex with Penny. They decide not to share this with the others.