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Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
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.