Generator Rex is an American animated science fiction television series created by Man of Action for Cartoon Network, with John Fang of Cartoon Network Studios serving as supervising director. It was inspired by the comic M. Rex, published by Image Comics in 1999. The series premiered in the United States on April 23, 2010 on Cartoon Network. The last episode of the series aired on January 3, 2013.
Five years prior to the series, a massive explosion released high concentrations of nanites into the atmosphere, infecting almost every living thing on Earth. These nanites may randomly activate inside their hosts, mutating the subject into a monster known as an E.V.O. (short for "Exponentially Variegated Organism"). Though some E.V.O.s retain human-level sanity, intelligence, and memory and are in full control of their special E.V.O. abilities, most transform into monster-like creatures and go violently berserk, causing widespread chaos and destruction. An international military-style organization known as Providence exists to combat the E.V.O. threat.