2009 was a monumental year for the UFC that saw the organization put on its historic 100th event, as well as welcoming many popular mixed martial arts veterans back into the UFC fold. This retrospective of the year includes incredible fights from the Octagon including the heavyweight unification title bout between Brock Lesnar and Frank Mir, BJ Penn vs.. Kenny Florian, Rashad Evans vs.. Lyoto Machida, and many others, plus a salute to Chuck Liddell.