Great Mazinger vs. Getter Robo is an animated short film produced by Toei based in the works of Go Nagai and Ken Ishikawa. The film premiered originally in March 21, 1975 in Japan. It is a crossover between the super robot anime Great Mazinger and Getter Robo, similar to the previous crossover film Mazinger Z vs. Devilman. The events presented in the film are not considered canon to either of the two series. The film was also shown in countries where the two TV series were broadcast.