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Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette.
When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.
When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.
Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.