'Big Bang Theory' cast performs 'Rocky Horror's 'Time Warp' (Photos)

Slideshow posted in Photos | Friday, March 22, 2013

11 of 51: Johnny Galecki, left, and Zachary Levi pose backstage at the 21st annual 'A Night at Sardi's' benefit for the Alzheimer's Association at the Beverly Hilton Hotel on March 20, 2013. ( Photo / John Shearer / Invision for Alzheimer's Association / AP Images)

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