The next big thing in the WWF. Brock Lesnar is a professional wrestler.
This guy is huge! Various collegiate wrestling websites have him listed as 285 lbs., which comes to about 758 lbs. in professional wrestling units.
Brock grew up on a farm (much like Rulon Gardner) in Webster, South Dakota. He wrestled in high school, where he had a 33-0 record. In 1998, he became the NJCAA (NCAA for junior colleges) Heavyweight Champ. He then went to a non-junior college, finished in 2nd place as an NCAA Heavyweight. The next year, he became the NCAA champ.
He then decided to pursue a career in professional wrestling. He spent some time in the WWF's development federation, where he learned the ropes and impressed the bosses. He was called up to the WWF during the "brand extension" (see WWF Roster Split) storyline (April 2002) and ended up on Ric Flair's RAW show. He entered the WWF and made his presence known by demolishing a number of 'smaller' wrestlers, no doubt under the evil-influences of the heel manager Paul Heyman. His first big match was at Backlash (2002) where he mopped the floor with Jeff Hardy, one of the Hardy Boys with which Brock has started a feud.
He uses big power moves that may be impossible for other wrestlers to match. He has apparently performed triple-powerbombs on people. His finisher currently appears to be the Spiral Bomb.
He looks to be a promising young wrestler who is entertaining to watch. Hopefully, he'll have a long and injury-free career for many years to come. Like Davidian says below, his moveset is currently limited, but it's probably easier to learn how to do a step-over spinning heel kick than it is to learn how to lift Rikishi over your head.
update 9/2002
Within the last few weeks, Brock has:
Additionally, someone has decided that his finisher move that was described above as a Spiral Bomb should be called the F5. Not sure the origin of the name. Perhaps named after the United States Fighter Aircraft of the same name? Or perhaps a reference to the highest classification of tornados?
update 12/2002
Lost his championship belt to Big Show when Brock's manager Paul Heyman interfered on behalf of Big Show. This has made Brock very upset, and Paul Heyman is now Big Show's manager. He's recently been doing run-ins rather than wrestling actual matches, probably to let his injured ribs heal.
update, post Wrestlemania XX
Brock has left the WWE, supposedly to pursue an NFL career. As he went straight from collegiate wrestling to the WWE, he probably didn't realize that the travel schedule of professional wrestlers is atrocious. There are reports that he was not happy with the traveling.
update, summer 2004
Brock has managed to make good on his attempt to start an NFL career, which is surprising for someone who didn't have football experience in college. He has signed with the Minnesota Vikings and I think he's managed to make the practice squad.