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Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
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.