Yes.
Shane Carwin he knocked out Brock Lesnar.
He is now a UFC fighter. He is now a UFC fighter.
Brock Lesnar. He was 25 years old when he won the WWE Championship.
No.
Erik Paulson has: Played Himself - Fighter in "World Combat Championship" in 1996. Played Stellio in "Bloodsport III" in 1996. Played himself in "The Ultimate Fighter" in 2005. Played himself in "UFC 87: Seek and Destroy" in 2008. Played himself in "UFC 81: Breaking Point" in 2008. Played himself in "UFC 100: Lesnar vs. Mir" in 2009. Played himself in "UFC Primetime: Lesnar vs. Velasquez" in 2010. Played himself in "UFC 121: Lesnar vs. Velasquez" in 2010. Played himself in "UFC 116: Lesnar vs. Carwin" in 2010.
Brock Lesnar did at ufc 100
Brock Lesnar. He can defeat even the most improved created fighters
Yes, Brock Lesnar is a real fighter. During his term at MMA, beginning in June 2007, he won several championships. He retired from MMA fighting in December 2011 and returned to WWE wrestling in April 2012.
Brock Lesnar won the world heavyweight championship at the age of 24
Brock Lesnar was never retired. In 2004 Lesnar departed from World Wrestling Entertainment (WWE) to pursue a career in the National Football League (NFL). After the NFL, Lesnar pursued a career in mixed martial arts. In 2008, reached a deal to fight with Ultimate Fighting Championship (UFC). In 2012, Lesnar returned to the WWE. In March of 2015, Brock Lesnar announced on ESPN that he signed a new contract with WWE.
Brock Lesnar, SummerSlam 2002 5 months or so after his debut
Brock Lesnar was not fired from the WWE. He did not renew his contract with the WWE, so they let him go off. He joined the UFC league as a mixed martial arts fighter. There are rumours that he may come back to the WWE.