The very first Australian Ninja Warrior Grand Final. From 250, the final 21 Ninjas have gathered for the Grand Final and the ultimate title: the first Australian Ninja Warrior.

Eight episodes in, Australian Ninja Warrior has lived up to its global reputation. It truly is the toughest, most challenging obstacle course in the world.

It's the second of the three semi finals and 30 Ninjas will take their shot at glory. Only 7 can qualify for the Grand Final and a shot at conquering Mount Midoriyama.

Tonight is the first Semi Final if the Ninjas thought the heats were tough, they haven't seen anything yet!

Tonight is the final heat before the semi finals – 50 Ninjas are competing for the last 18 spots. And they will have to face some new obstacles to make it there.

Tonight, Ninja Island will host its first Battle of the Codes when NRL Star and Footy show host, Beau Ryan steps up to the podium against AFL Star, Adam Cooney.

Tonight, 50 new competitors face the Ninja course. Three new obstacles make their debut in Heat 3: The Bomb Slider, The Cargo with Lache and The Ball and Chain.

Heat 2 features the 'Battle of the Tradies', the only huband and wife team, Queenslander larrikin mates and a former elite gymnast from WA.

From our every day heroes to our top sportsman and women – Australian athletes are all lining up to take their shot at the most difficult obstacle course in the world.