 A heavily edited dubbed English language version was released in the US as  "Revenge from Planet Ape" to try and cash in on the popularity of the "Planet  of the Apes" films. This came with a narrated introduction saying how  "thousands of years ago, humans were slaves to a bunch of intelligent apes,  which they eventually overthrew and killed, but the apes vowed to return from  the grave". This somewhat bizarre intro can be seen as an extra on the US DVD  by Blue Underground.