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

<div class="meta "><span class="caption-text ">From left, actors Kunal Nayyar, Melissa Rauch, Jim Parsons, Mayim Bialik, Simon Helberg, from the cast of &#39;The Big Bang Theory,&#39; and Alzheimer&#39;s Associatin&#39;s Laurie Grad arrive at the 21st annual &#39;A Night at Sardi&#39;s&#39; benefit for the Alzheimer&#39;s Association at the Beverly Hilton Hotel on March 20, 2013. (Jordan Strauss &#47; Invision for Alzheimer&#39;s Association &#47; AP Images)</span></div>
March 22, 2013 12:00:00 AM PDT