The Big Bang Theory Mega Buzz: Who's Keeping a Huge Secret?

The Big Bang Theory is ramping up the drama leading up to its milestone 200th episode, andThursday's Valentine's Day episode has a big surprise in store.

Everybody is dealing with Cupid's holiday - or as Penny (Kaley Cuoco) calls it, National Sex Night -- in their own way. Sheldon (Jim Parsons) and

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Other Links From TVGuide.com

• The Big Bang Theory
• Kaley Cuoco
• Jim Parsons
• Mayim Bialik
• Kunal Nayyar
• Simon Helberg
• Melissa Rauch

Source TVGuide.com: Breaking News http://ift.tt/1POoFCA