Dan Mast is a Stuntman/Tempest Free-Runner who in American Ninja Warrior 4, started wearing a Tuxedo Speedo. In American Ninja Warrior 3, he completed Qualifying, but didn`t make the Top 30. In American Ninja Warrior 4, he had the 2nd fastest time in Qualifying, but had the 10th fastest in the Southwest Finals. At Mt.Midoriyama, he got through the Jumping Spider, but failed on the Half-Pipe Attack. In American Ninja Warrior 5, he got injured on the Flying Nunchucks in Venice Qualifying, but still placed 26th in Qualifying. In the Venice City Finals, he made it through the Rope Maze, but just had nothing left for the Cliffhanger. However,he did enough to place 8th and made it to Mt.Midoriyama for the 2nd straight year. At Vegas, he failed on the Giant Cycle.
He returned back in American Ninja Warrior 6, where he cleared the Venice Qualifier again. However in the Venice Finals, he went out on the Salmon Ladder and didn't make it to Vegas, but could still be a Wildcard.