The cast of "The Big Bang Theory" are apparently BIG "Rocky Horror Picture Show"  fans.

Jim Parsons, Kaley Cuoco, Kunal Nayyar, Johnny Galecki and Mitch Hurwitz dressed up as the kinky characters from the cult classic to perform "Time Warp" on Wednesday night -- with Parsons throwing on fishnets and a wig to play Dr. Frank N. Furter!

The gang performed the song as part of A Night at Sardi's Gala benefiting the Alzheimer's Association at the Beverly Hilton Hotel.

How do you think they did? The costumes make this performance for us.

Check out the original below:

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