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As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
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.