Dan Mast is a stuntman and Tempest Free-Runner who in American Ninja Warrior 4, started wearing a Tuxedo Speedo.
American Ninja Warrior 3
He first competed in American Ninja Warrior 3. Dan had completed qualifying, but didn`t make the Top 30.
American Ninja Warrior 4
In American Ninja Warrior 4, he had the 2nd fastest time in qualifying, and had the 10th fastest time in the Southwest Finals. At the Vegas Finals, he got through the Jumping Spider, but failed on the Half-Pipe Attack.
American Ninja Warrior 5
In American Ninja Warrior 5, he got injured on the Flying Nunchucks in Venice qualifying, but still placed 26th at the end of the night. In the Venice city finals, he made it through the Rope Maze, but just had nothing left for the Cliffhanger. However, he went far enough to place 8th overall and participate in Las Vegas for the second straight year.
In Vegas, he failed on the Giant Cycle.