I last saw this movie about 20 years ago on VHS and it was a scream but with there being no sign of a region 2 release I bought the region 1 version, ah! the memories flooded back.
4 balloonists, and a dog, get stranded on an uncharted island after a violent (and unseen) storm. They come across native women in leopard effect bikini's, some oddballs and the world's worst mutant zombie creatures who, to emphasise their unworldly nature, wear black hats, black jumpers and sun-glasses. One wears contact lenses when he takes his glasses off, oh! and I forgot to say they feed on psychic energy.
Two B movie icons appear in this movie, John Carradine as Dr. Frankenstein who appears as a ghost image super-imposed over the "action" waffling on about the "golden thread" and "the power". His scenes are reminiscent of those seen in Tim Burton's wonderful Ed Wood where Wood has Bela Lugosi "pull the strings" over a stock-footage stampede.
The other "star" is Cameron Mitchell who plays a Poe quoting sea captain who has been a prisoner, and blood-donor, for 17 years, calculated from some odd marking system on a board he has.
The lead female role is that of Sheila Frankenstein von Helsing, you soon get the feeling they are trying to drop every single cliche into this movie and have no shame about it.
There is so much drivel going on here that you are spoiled for choice. There's fights that are apparently choreographed by pacifists, speeches that have no relevance to what is going on in the movie at all and special effects that are neither special nor effective.
The whole thing is so amateur it is quite charming but the coup-de-grace is saved for the end as Frankenstein's monster is released from its watery grave and goes on a rampage that would leave Noddy slightly perturbed. It groans, waves its arms around, strangles 2 slow moving people and turns a table over in its "rage". You really have to see this to believe it.
Be warned that unless you like watching grade-Z movies steer well clear and save your money, if you like turkeys you will be rewarded beyond your wildest dreams.