The qualifying rounds continue with the craziest obstacle yet and six new racers. The standout is a 21-year-old nicknamed the Baby-Faced Assassin.

With the final three spots in the top 12 up for grabs, the remaining drivers -- including a man who works four jobs -- pull out all the stops.

As the knockout round begins, the drivers must prove themselves on a newly redesigned course. But not everyone's car survives the chaos.