A firefighter and a prison guard are among the contestants who face the Blades of Fury, the Gears of Doom, the Banana Split and the Onion Ring Hurdles in an extreme obstacle course.

Contestants in Australia tackle obstacles including Big Balls.

Contestants face the brush rush, the aqua launch and the buoy run as they compete in an extreme obstacle course to win the $50,000 grand prize.

Contestants, including a professional boxer and a stay-at-home dad, face the Ballsy-Go-Round, Mesh Mosh Run and Swinging Cereal Killer.

Contestants face the Blue Ball Run, the Sweeper Wall and the Dodge Ball Beam Walk as they compete for the $50,000 grand prize.

Former fan favorites return for an all-star episode in which contestants take on an obstacle course in hopes of winning the $50,000 grand prize.

New obstacles facing the contestants include the log roll, the wedge turntables and the fender benders as they compete to win the $50,000 grand prize.

A skinny medical student and a 58-year-old grandmother face obstacles such as the sweeper trees, the slippery swing set and the scary-go-round to win cash.

Couples compete in the obstacle course.

Contestants face Spike Fenders, Spinning Triangles and Drop Bridge.