Killer Legs is a human interest documentary following a challenge to one up and coming martial arts action star (Alex Wraith) to test the speed of his kicks against the legendary Bruce Lee (speculated 72 mph kick). The journey delves into the importance of Bruce Lee with regards to Hollywood actions films (specifically martial arts films), and Bruce's inspiration to current marital artists, including Alex Wraith... but can Alex break the 72 mph speed record?

Director Nathan McCoy narrates and guides the viewer through the personalities (some famous), and world class athletes that train at the legendary Gold's Gym in Venice, California. From there Alex shows off his results to random pedestrians on the nearby Venice beach. Finally, Alex's kicks are tested at the USC's Biomechanics Injury Research Lab. Cynthia Bir (scientist from Fight Science), leads a team of researchers and experts to quantitatively measure Alex's strength and speed; and the results are shocking!