Sheldon's interview for a "Star Trek" documentary focusing on Spock turns up a shocking revelation about his breakup with Amy. Meanwhile, the Wolowitzes haggle over the remodeling of his family home.
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When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him.
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Now just friends, Sheldon and Amy spend Thanksgiving at the aquarium; a reluctant Wolowitz volunteers at a soup kitchen with Bernadette, Raj and Emily; and Penny realizes that Leonard knows a bit more about her than he's let on.
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When Sheldon decides he'd rather go to a movie screening than hang out with Amy, he hires Stuart to spend the day with her. Meanwhile Leonard's mother visits, and Penny just can't seem to connect with her.
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In the Season 10 premiere, the gang deals with the awkward aftermath of an overnight liaison between Sheldon's mother and Leonard's father. Meanwhile, Penny's dysfunctional family is in town for the wedding.
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The guys heads are in a spin when an Air Force bigwig approaches them about their revolutionary gyroscope invention; and Bernadette is upset with Penny after she leaks a secret to the mom-to-be's coworkers about her being pregnant.
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After a marital disagreement, Penny takes off for a spa weekend with Amy, and Sheldon steps in to play peacemaker for the squabbling newlyweds. Meanwhile, Howard and Raj do battle with a noisy floor in the baby's room.
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Sheldon learns about an MIT invention that can help read people's emotions. Leonard has trouble hiding his emotions when Penny announces her brother is going to visit; and Raj gathers former girlfriends to ask for their dating advice.
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With Sheldon hindering progress on the guidance-system project, Leonard and Stuart figure the only way they can get back on track is to engineer a distraction by getting him tickets to a historic railroad.
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Amy is incensed when she discovers Sheldon has shared intimate relationship information with people at the University; and Raj is knocked for a loop when his father stops sending financial support.
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