Snooki, Valerie Harper, Keyshawn Johnson and more
Bill Nye - Science Guy
Why he could be great: He's lithe and limber-looking, and he may have cracked a secret formula to the perfect dance move.
Why he could be awful: According to Wikipedia, Nye spent the '70s developing a hydraulic pressure resonance suppressor for use in 747s. He probably didn't have much time to cut a rug.
Our Verdict: Whatever the result of the competition, Nye is bound to be a welcome, dryly humorous presence.
Odds: 6 to 1