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The Big Bang Theory Season 5 Episode 20

Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the “Future Mrs. Koothrappali” after his parents set him up on a date.

Episode Title: The Transporter Malfunction

Air Date: 2012-03-29