Sean Clayton is a Construction Worker and army veteran who first competed in Orlando in American Ninja Warrior 7. In Qualifying, his run was cut but it was revealed that he fell on the Double Tilt Ladder he did place 27th overall. In the city finals, his run was digested but it was shown that he fell on Cannonball Alley, he did place 9th overall and moved on to Vegas. His run on Stage One was digested but it was shown that he finished Stage One with 21.64 seconds left. His run on Stage Two was cut but it was revealed that he fell on the Unstable Bridge.
Clayton has repeatedly tried to come back on the series but never received any further invitations.