Action Man helps Knuck investigate his nephew Tom who has been involved in Gangrene's X-Vitamin steroid tests. Action Man tricks Dr. X into destroying Gangrene's lab and prevents him from putting the X-Vitamin into the city's water supply.

Live action mission: Disrupt blockage in Lake Ontario, Canada. Team mate on radio: Action 3 (Natalie).

Action Man's end-of-episode lesson: Drugs.