Seasons 1 and 2 were hosted by Tony Hawk. Season 3 was hosted by J.D. Roth. Season 4 was hosted by Steve-O. Season 5 was originally hosted by Steve-O, but early into the season due to personal matters, Jim Breuer became host. Season 6 was hosted by Mark Moses.
Extreme Challenge is still an active show. With CBD hinting another season will return.