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

From left, actors Kunal Nayyar, Melissa Rauch, Jim Parsons, Mayim Bialik, Simon Helberg, from the cast of 'The Big Bang Theory,' and Alzheimer's Associatin's Laurie Grad arrive at the 21st annual 'A Night at Sardi's' benefit for the Alzheimer's Association at the Beverly Hilton Hotel on March 20, 2013. <span class=meta>(Jordan Strauss / Invision for Alzheimer's Association / AP Images)</span>
March 22, 2013 12:00:00 AM PDT