As of 6/12/15 (12th June, 2015), has passed uncut with an '18' certificate for "Strong gory violence and horror" under the title 'The Savage Island'.
Carol:
There's evil on this island. An evil that won't let us get away. An evil that sends out an inhuman, diabolic power. I sense its vibrations now. The vibrations are an intense horror. It will destroy us! The very same way it did all the others!
Andy:
Shut up...
The American region 0 version (aka "The Grim Reaper") replaces the original music with the soundtrack used in Kingdom of the Spiders (1977). In addition to that, two scenes of extreme gore were cut; the first is where the maniac pulls out and eats a woman's unborn baby. The other is the final scene which after the maniac is stabbed by a pickaxe in the abdomen, he pulls out and starts to eat his own entrails in a futile attempt to keep them inside him which completely alters the ending of the film. This version in total appears to be around 10 mins shorter than the full 91 minute Italian version, though some of the edits are also dialogue scenes. The U.S Special Edition on the Media Blasters/Shriek Show label is the original version and fully uncut.
Italian, German