With the main airport under military control, the Americans converge on an airstrip where Rick Pearsall runs an air transport service with his DC-3.

When Rick and Frank enter the water to beach the raft for the night, they are attacked by an unseen underwater creature, with squid-like tentacles and spines like a sea urchin.

Diana deduces that the station was involved in research for a wide range of biological weapons, including extrasensory perception, as in Rick's case.

Rick returns after visiting the village and finding a hut with research materials from a scientist with a conscience, who had sabotaged the station and taken an antigen with him.

Rick is given the remainder of the elixir and improves, but he retains his extrasensory abilities, deducing from a brief touch that Laura is a model (which she's ashamed of being) and that Ben has been to the island before.