Shredder, Bebop, and Rocksteady are in town to steal a rare new mutagen created by Oswald Dren, a grad student. Some mutagen is accidentally spilled onto a reel of movie film and monsters and a movie hero named Rondo come to life! The real Rondo is a wimp, and the Turtles try to help him confront the now-living monsters that stalk the street and the movie theater where the Monster Movie Marathon took place. With the turtles' help, Shredder and the mutants fail to steal the mutagen. (thetvdb.com)