Mark "The Shark" Antioquia is a gym director from Norwood, Massachusetts. He is best known for wearing a shark costume on the start line. He is married to fellow competitor Heather Petty, who is known for wearing a T-Rex costume at the start line.
American Ninja Warrior 10[]
Mark was a course tester for Cleveland and Vegas in American Ninja Warrior 9, but did not first compete until in Philadelphia in ANW 10. His run was cut, but he was one of several to fail the fourth obstacle, the Wingnuts, and didn't make the top 30.
American Ninja Warrior 14[]
He did not compete in American Ninja Warrior 11, instead being a Baltimore and Vegas tester. He was originally selected to compete in American Ninja Warrior 12, but due to the COVID-19 pandemic was unable to run that year. He didn't compete in American Ninja Warrior 13, but later returned for his second appearance a season afterward in American Ninja Warrior 14.
In the qualifying round, he competed in the fourth episode. There, he put a successful run, being one of just eight to complete Final Frontier and finished the course entirely, placing 7th.
In the semifinals, he competed in the fourth episode. He made it past the first two obstacles, but splashed down on Air Surfer, ending his season.