UFC free-fight: Watch Cain Velasquez demolish & dethrone Brock Lesnar at UFC 121

Remember when Cain Velasquez dethroned the most famous UFC heavyweight champ of all-time at UFC 121 in October, 2010 in Los Angeles? The UFC wants to remind you so they're making the full fight video free on YouTube. Just in time for you to get hyped about Cain's return to face interim heavyweight champ Fabricio Werdum at UFC 188 this Summer in Mexico City.

Here's what our own Luke Thomas said about the fight at the time.

"This was being billed by some as the greatest heavyweight fight ever in UFC history. The physical phenom in Brock Lesnar was betting his athleticism could overcome his relative inexperience. He was also betting it was too much for the challenger Cain Velasquez to handle - no matter the AKA product's gas tank, no matter his technical superiority.

"And technical superiority it was. There wasn't even a mark on Velasquez's face. While Lesnar was able to execute takedowns and even unload punishment of his own, this night belonged to Cain Velasquez. The idea that where Carwin fell off Cain could continue was true. Cain took his time to finish and that he did.

"This is the first combat sports champion of Mexican origin in the heavyweight ranks. The stoppage was fair. Lesnar turned his back, forcing the referee to stop the fight."