After being conquered last year, Mt Midoriyama wants revenge. Ninja's will be challenged in new and unexpected ways on the toughest course ever designed.

It's the last of the Australian Ninja Warrior Semi Finals and the last chance for a coveted spot in the Grand Finals.

Tonight on Australian Ninja Warrior is the first Stage of the 2021 Grand Final, only Ninjas who rise to the challenge and hit the buzzer within the time limit.