A Towson University grad, Catanzaro became the first woman to complete one of the final obstacle courses and advance to the show's ultimate challenge, Mt. Midoriyama.
Catanzaro, who is apparently 95 percent muscle and 5 percent beaming smile, used skills she honed on Towson's gymnastics team to tackle obstacles such as the salmon climb, the swinging frames, the spider climb, and other feats rarely seen outside of a Spider-Man film.
The diminutive 100-pound athlete even managed to defy gravity by running up a wall, a move that drew gasps from the audience and perplexed the ghost of Isaac Newton.
Catanzaro's performance has inspired legions of fans who made #mightykacy trend on Twitter Tuesday.