Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable Bitcoin investment. Also, a seven-year-old video reveals a secret about Leonard and Penny's relationship.
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Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Raj "breaks up" with Howard after realizing his best friend is actually hurting his confidence.
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Sheldon and Howard plan birthday celebrations for Amy and Halley, respectively. Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.
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To discover who would be most qualified to be best man and maid of honor at their wedding, Sheldon and Amy subject their friends to a series of secret experiments. Also, Penny reveals her true feelings about Amy.
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When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Bert replaces Howard in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.
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Sheldon goes to Vegas to win money for science. Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.
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When Sheldon learns that his mother won't attend his wedding unless he invites his brother, George, he and Leonard travel to Texas to end a family feud. The Wolowitz kids inadvertently infest Amy, Bernadette, Howard and Raj with pinkeye.
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The Season 11 finale: When Amy's parents and Sheldon's family arrive for the wedding, everybody is focused on making sure all goes according to plan--everyone except the bride and groom.
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In the Season 12 premiere, Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents. Raj insults physicist Neil deGrasse Tyson and starts a twitter war.
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Sheldon and Amy drive themselves crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding. Raj decides he wants to settle down and asks his father to arrange a marriage for him.
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Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon's past inspires him not to give up. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.
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In the series finale, Bernadette and Howard leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Raj makes a new friend, as the gang travels together into an uncharted future.
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