UFC 155 photos are for the UFC event at the MGM Grand Garden Arena in Las Vegas, Nev. on Saturday night. UFC heavyweight champion Junior dos Santos will square off against former UFC heavyweight champion Cain Velasquez in the main event.

The UFC 155 weigh-in photos are from Friday's UFC event at the MGM Grand Garden Arena. Junior dos Santos and Cain Velasquez both made weight for the main event. In the co-main event, Jim Miller and Joe Lauzon also both made weight.

UFC 155 press conference photos feature UFC heavyweight champion Junior dos Santos, Cain Velasquez and UFC President Dana White at Studio A&B at the MGM Grand in Las Vegas, Nevada.

Check out all the action from UFC on FOX 5 in our photo gallery.

B.J. Penn and the other 21 fighters on the UFC on FOX 5 fight card hit the scales at the UFC on FOX 5 weigh-ins Friday afternoon.

UFC on FOX 5 press conference photos feature UFC light champion Ben Henderson, Nate Diaz, Mauricio Rua, Alexander Gustafsson, B.J. Penn, Rory MacDonald, Mike Swick, Matt Brown and newly-crowned UFC women's bantamweight champion Ronda Rousey.

Check out our photo gallery from Wednesday's UFC on FOX 5 workouts at the Menzies Ballroom in the Grand Hyatt Seattle in Seattle, WA on December 4, 2012.

Check out our UFC 154 photos from Saturday night's UFC event in Montreal.

The UFC 154 weigh-in photos are from Friday's UFC event at New City Gas in Montreal, Quebec, Canada on Friday, Nov. 16, 2012. Georges St. Pierre (170 pounds) and Carlos Condit (169 pounds) both made weight for the main event.