Eight former Grand Finalists are among those battling for the last 16 Semi-Final spots, with the two fastest Ninjas of the night facing off on the all new Power Tower.

It's the first of two Semi Finals, with new and fan favourite Ninjas taking on one of the hardest Semi Final courses ever.

The second of two Semi Finals, tonight some of the biggest names in Australian Ninja Warrior tackle one of the hardest Semi Final courses ever!