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!

The biggest names in Australian Ninja Warrior take on a brutal obstacle course with 3:45 on the clock and a spot in Grand Final Stage 2 up for grabs.