Six qualifiers compete for three spots in the championship final, with a new twist that raises the intensity. One athlete hopes a big gamble pays off.

The Beast evolves again with a new obstacle called "Rib Cage Row," and two of nine contenders will grab the first spots in the second semifinal.

The "Crash Pads" return, and a twisty new obstacle greets a group that includes the competition's youngest athlete and a cancer survivor.