Monster a Go-Go! is a 1965 science fiction horror film directed by Bill Rebane and Herschell Gordon Lewis (who remained uncredited in association with this film). The film is considered to be one of the worst ever.The film was featured in an episode of movie-mocking television show Mystery Science Theater 3000 on Comedy Central. As it is an incredibly blatant deus ex machina, the phrase "but there was no monster!" became an often repeated riff for similar events in other films.