Video: Official Weigh-in: Chris Weidman 185 vs Luke Rockhold 185

In the most anticipated matchup in UFC® history, two kings battle for one throne, as inaugural UFC featherweight champion and pound-for-pound great Jose Aldo returns to face newly-crowned interim champion Conor McGregor in the five-round main event of UFC 194®. Plus, undefeated middleweight champion Chris Weidman puts his spotless record on the line when he meets No. 1 contender Luke Rockhold in the co-main event. UFC 194®: ALDO vs. McGREGOR takes over the MGM Grand Garden Arena on Saturday, Dec. 12.

In the second half of this championship doubleheader, undefeated middleweight champion Chris Weidman (13-0, fighting out of Baldwin, N.Y.) will clash with former STRIKEFORCE® middleweight champion Luke Rockhold (14-2, fighting out of San Jose, Calif.) in the co-main event. Having defeated former champions Anderson Silva (twice), Lyoto Machida and, most recently, Vitor Belfort, Weidman looks to add another name to his perfect record. Rockhold earned his crack at the title after racking up four stoppage victories, including impressive second-round submissions over Machida and Michael Bisping. This high-stakes bout has analysts wondering if this could be the greatest middleweight matchup in UFC history.