'The Big Bang Theory' preview: Bob Newhart and Bill Nye face off - Watch

"The Big Bang Theory" is preparing for one heck of a showdown on Thursday (Nov. 7) when Bob Newhart returns as Professor Proton and squares off against the one and only Bill Nye.In a preview clip of the episode, things get heated when Sheldon (Jim Parsons) jabs back at his idol after a perceived slight by bringing in "a newer model." Newhart's Proton doesn't take this too well, bellowing at Nye, "Back off, bow tie!"Nerd fights -- does it get any better than that?Check out the clip above and let us know if you're psyched for the big episode."The Big Bang Theory" airs Thursdays at 8 p.m. ET on CBS....



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