The widely held belief is that Brock Lesnar would be immediately booked into a rematch against Alistair Overeem if he decides to return to UFC. Overeem was the person that defeated him for the heavyweight championship before he decided to retire from MMA and return to WWE.
"It was over a video game. Vince signed a contract with (Nintendo) and told me that I couldn't sign an endorsement deal with another company (Sega). I told Vince that he didn't own me; I wasn't working under a contract at that time."