It's the biggest event in Ultimate Fighting Championship history, and all the superstars are here for UFC 100 at the Mandalay Bay Events Centre in Las Vegas. Heavyweight champion Brock Lesnar and Frank Mir meet in the most highly anticipated heavyweight rematch ever, welterweight superstar Georges St-Pierre defends his title against number one contender Thiago Alves, and The Ultimate Fighter coaches Dan Henderson and Michael Bisping finally meet in a fight you won't soon forget.