Okay, here's my idea. It's simple, one-sided, and in my mind totally worth it.
Inexplicably famous people vs Utahraptors
The Inexplicably Famous side will consist of Justin Bieber, Paris Hilton, and Megan Fox, as well as anybody else whose fame greatly exceeds any actual cause for fame they might have. Feel free to mention them on this thread, I really can't bring myself to care enough.
The Utahraptors will be equal in numbers to the celebrities, basically putting them up against the raptors from Jurassic Park.