Six teams arrive in Tucson, Ariz. for a racing competition with $5K hoopties; then the teams must build and modify their vehicles for the final drag race.
Entering the third event, the teams are learning to expect the unexpected. Team Wagon Slayer pulled out the win on the dirt circle track, while Team MR2-D2 is still fighting engine issues, and Team Blackhawk had to rebuild their transmission overnig.
At the penultimate event at the HWC, the teams continue to press forward with little regard for their personal well-being.
The teams compete in the sixth and final challenge, the mega-gauntlet, covering dirt, asphalt, drift, off-road hazards, slalom and drag.