July 11, 2009 marked a momentous occasion, as the UFC celebrated its 100th event in Las Vegas. The fight card boasted two title bouts. Former WWE superstar Brock Lesnar took on Frank Mir in a rematch to unify the heavyweight belt, and Georges St-Pierre squared off against Thiago Alves to defend his welterweight crown. Other matches included "TUF Season Nine" coaches Michael Bisping and Dan Henderson engaging in a stand-up battle. 6 hrs. Widescreen; Soundtrack: English; bonus footage; featurettes.