Horrors of Spider Island

Gary is bitten by a giant spider while exploring the island alone at night. The venom from the bite triggers a transformation that turns him into a spider-man beast with uncontrollable violent urges. This explains why he immediately flees into the woods and later attacks and kills the other survivors.

The dead professor's journal mentions he feared something terrible was about to happen, hinting the island already held dangerous secrets.

Gary kills Linda the morning after his transformation while she sits by a stream. His transformation into the spider-man creature has stripped him of his humanity and given him predatory instincts. He attacks her without recognition or mercy, treating her as prey rather than someone he knows.

Gary's sudden departure from the cabin after the spider bite foreshadows his dangerous change in nature.

After Gary attacks Joe at the cabin and Georgia drives him off with a flaming torch, Joe convinces the women to chase him with torches toward a quicksand pond. The group cornered Gary in the quicksand, and he sinks and drowns before they can escape the island. The women keep the torches lit to ward off any remaining predators.

The earlier discovery of the professor's fate foreshadows that the island claims those who wander into its dangerous terrain.

The surviving women, Georgia, Gladys, Babs, Nelly, and Kate, are rescued the next morning when the ship returns to pick up Joe and Bobby. The women escape the island after Gary's death in the quicksand pond, ending their nightmare ordeal on the island.

Joe and Bobby's arrival with news of the ship's return creates hope for rescue, which is fulfilled at the end.

Gladys goes into the jungle to meet Bobby but finds his dead body instead, Gary's latest victim. Her screams attract both the other women and Gary, who chases her to a clifftop. Gladys falls to her death during the chase, either pushed by Gary or falling accidentally while trying to escape.

The growing tension among the women and Gary's increasing attacks create a deadly atmosphere that claims more victims.

The women discover Professor Green's body caught in a large spider web inside the cabin. His journal reveals he was researching and mining for uranium on the island and feared something terrible was about to happen to him. He appears to have been killed by the same giant spiders that later bite Gary, though the timeline of his death is unclear.

Professor Green's fate directly foreshadows Gary's own transformation and death.

Gary kills Bobby because his monster transformation has made him a predator who attacks anyone on the island. Bobby is murdered while meeting Gladys in the jungle, this becomes Gary's third victim after Linda and the professor. The attack demonstrates Gary's complete loss of humanity.

Gary's earlier attacks on Linda and attempted attack on Georgia establish his pattern of targeting the survivors.

Gary attacks Georgia during the catfight between Babs and Nelly, appearing suddenly and trying to kill her before fleeing back into the jungle. His transformation has made him view his former companions as threats or prey. Georgia becomes a primary target possibly because she was closest to him before the transformation.

Gary's violent departure after the spider bite marked the beginning of his attacks on the group.

The women spot a ship on the horizon while running low on food, but they are unable to signal it before it leaves. However, two men named Joe and Bobby disembark from the vessel in a rowboat with supplies for Professor Green. They explain the ship will return to pick them up, offering false hope before more tragedy strikes.

The initial failed rescue sets up the arrival of Joe and Bobby, whose presence leads to more deaths.

Twenty-eight days pass as the women survive on the island's limited food supplies. Tensions rise steadily among the survivors, culminating in a catfight between the blondes Babs and Nelly. Gladys tries to break up the fight but is overpowered by Kate. The conflict is interrupted when Gary appears and attacks Georgia, reminding everyone of the monster lurking in the jungle.

The growing interpersonal conflict among the women mirrors the external threat from Gary, creating a tense atmosphere.