Grendizer, Getter Robo G, Great Mazinger: Kessen! Daikaijuu is an animated short film produced by Toei which premiered originally on July 18, 1976, in Japan. It is a crossover of three super robot anime: Grendizer, Getter Robo G and Great Mazinger. Like the rest of the Vs. animated films of Toei, the movie features alternate versions of events from the three series and is not canonical to any of them.