Captain Thorne Sherman and first mate Rook Griswold deliver supplies by boat to a group on a remote island. The group, consisting of scientist Marlowe Cragis, his research assistant Radford Baines, the scientist's daughter Ann, her recent fiancÃ© Jerry Farrel, and a servant Mario, welcome the captain and his first mate, but subtly resist the visitors staying overnight, even though a hurricane approaches. Thorne goes with the group to their compound. Griswold stays with the boat, to come ashore later.
The situation in the compound is less than safe. During evening cocktails, Thorne becomes aware of a life-threatening situation. Marlowe Cragis performs well-meaning research on serums and uses shrews as test animals. The doctor's purpose is to make humans half-size in order to reduce world hunger; smaller humans will eat less food on a planet with a limited food supply. Unfortunately, the doctor's experiments created mutant giant shrews that escaped and are reproducing outside the compound, growing larger by the day. The scientist and his staff barricade themselves inside their compound each evening.
Thorne and Ann begin to fall in love, causing jealousy in Jerry. Meanwhile, outside the compound, the giant shrews, which have a poisonous bite, are running out of smaller animals to eat. The shrews attack and kill Griswold. The giant shrews close in on the compound. One shrew breaks in through the window and hides in the basement. Mario and Thorne go down in the basement. Mario finds the shrew and shoots it, but it bites him. The shrew is then shot by Thorne and killed. The others arrive in the basement, but Mario dies. Radford discovers a highly toxic venom in the shrew's saliva, the result of poison bait he had placed in an attempt to kill the shrews. Another shrew breaks in and kills Radford. Before dying, Radford records the symptoms on his typewriter, right up to his death. From outside the compound, the shrews begin to chew through the compound walls on the main floor. The shrews force the group (save for Jerry, who wants to stay) out of the compound to escape to Thorne's boat. The group makes impromptu armor out of oil drums, lashes the armor together, and duck-walks together to the beach. Jerry changes his mind about individualism, and chases after the others. The killer shrews chase and seemingly kill Jerry. The socially cooperative group (Thorne, Ann, and Marlowe) manage a successful armored walk to the shore and swim to the boat.
On the boat, Thorne and Ann share a kiss and the film ends.
What is the name of the research assistant?
Radford Baines