Horrors of Spider Island is a 1960 West German horror film directed by Fritz Böttger. The film stars Alexander D'Arcy as Gary the talent agent who invites several girls to a club in Singapore. Their plane ride ends abruptly when they crash-land into the ocean. Gary and the girls make their way to an island where they find a dead man caught in a large spiderweb. Later a giant spider sinks its teeth into Gary which turns him into a murderous mutated creature.
Gary, a nightclub manager, flies a group of women from New York City to dance in his club in Singapore. While flying over the Pacific Ocean, their plane catches fire, splits in half, and plummets into the ocean. No one in Gary's group is killed. We next see the group days later, suffering from dehydration on a life raft, when they finally spot a small island and spend the night on the beach.
The next morning, they discover fresh water and decide to go exploring. They are quickly amazed and excited to find a cabin, but delight turns to horror when they open the door to discover a dead man hanging from a gigantic spider web. According to his journal, the man was a professor mining for Uranium, but he feared something terrible was about to happen to him. There's no indication how long the professor planned to be on the island, but the women estimate there is enough food to last them about a month.
That night, Gary proceeds alone out onto the island where he is bitten by a giant spider and turns into some type of spider-man beast. He flees into the woods, leaving the women to wonder what has happened to him. The next day, seemingly possessed by uncontrollable violent urges, Gary kills one of the girls. The remaining women, still unaware of what has happened to him, have no idea that he is the one who has done this.
A month passes, and the women are running low on food when they spot a ship on the horizon. They are unable to signal it before it leaves, but two men arrive in a rowboat with supplies for the professor. They soon find the women, who tell them the professor is dead. As they all wait for the ship to return, they celebrate their last night on the island with a wild party. One of the men sneaks off to rendezvous with a woman, but both end up being killed by Gary. Finally aware of Gary's fate, the remainder of the group hunts him down with torches until he flees into quicksand and dies.