Xtreme 4x4 is a half hour series airing on Spike TV that began in January 2005 as part of Spike's weekend Powerblock line up. The show uses a how-to format, where the hosts build or modify vehicles in order to turn them into off-road-oriented rigs. They also periodically show various forms of off-road racing from across the United States. These include such events as rock crawling, desert racing, sand drags, mud racing, and trail riding adventures. The hosts, Ian Johnson and Jessi Combs, were selected as part of a publicized, nationwide search for hosts where viewers were encouraged to send in their videos and resumes to Spike TV executives. Both hosts have appeared on other automotive shows including Discovery Channel's Monster Garage and TLC's Overhaulin'.