It all comes down to this. The top six drivers race through nine obstacles to determine the ultimate champion on four wheels.

It all comes down to this. The top six drivers race through nine obstacles to determine the ultimate champion on four wheels.

The course is downright diabolical. The margin for error is thinner than ever. The finale is nearly here. Go, drivers, go!

The course is downright diabolical. The margin for error is thinner than ever. The finale is nearly here. Go, drivers, go!

A few old favorites return to the course for a series of head-to-head battles. The prize: a second chance at glory.

A few old favorites return to the course for a series of head-to-head battles. The prize: a second chance at glory.

With the competition down to eight drivers, the track designers crank up the difficulty with a new obstacle that turns out to be alarmingly dangerous.

With the competition down to eight drivers, the track designers crank up the difficulty with a new obstacle that turns out to be alarmingly dangerous.

A new obstacle humbles the racers -- even one indomitable driver. Another contestant's overconfidence proves costly on the track.

A new obstacle humbles the racers -- even one indomitable driver. Another contestant's overconfidence proves costly on the track.

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

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

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.

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.

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.

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.