The Engagement Reaction
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When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
The Cruciferous Vegetable Amplification
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Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
The Robotic Manipulation
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Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
The Bus Pants Utilization
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Leonard's idea for a smartphone app derails his friendship with Sheldon.
The Justice League Recombination
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The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
The Alien Parasite Hypothesis
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Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
The Boyfriend Complexity
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Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
The 21-Second Excitation
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While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
The Apology Insufficiency
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Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
The Irish Pub Formulation
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Leonard keeps an affair a secret from Sheldon, Howard and Raj.