A heavyweight title shot is on the line in the main event of UFC 131, as two of the hardest punches in mixed martial arts history, Junior dos Santos and Shane Carwin, fight for the right to face champion Cain Velasquez. Plus, longtime contender Kenny Florian makes his featherweight debut against Diego ''The Gun'' Nunes, middleweights Demian Maia and Mark Munoz go to war, and Sam ''Hands of Stone'' Stout looks to stop the hot streak of veteran Yves Edwards.Special Features: Weigh-In Show, Countdown to UFC 131, Behind-The-Scenes, and UFC.com Featurette