LAST WOMAN ON EARTH

Harold Gern (Antony Carbone), a successful businessman from New York who is constantly in legal trouble, is spending a holiday in Puerto Rico with his attractive wife, Evelyn (Betsy Jones-Moreland), whom he married "between trials." They are joined by Martin Joyce (Robert Towne, billed as Edward Wain), Harold's lawyer, who has come to discuss the latest indictment.

Harold invites him along on a boat trip during which all three try out some newly bought scuba diving equipment. When they resurface, they are unable to breathe without using their scuba tanks. They climb back into their boat and find Manuel, the crewman, dead, apparently of asphyxiation. Upon rowing ashore, they enter the jungle. With their air running out, they discover that the foliage gives off oxygen that they can breathe.

When they go into town, they find nobody left alive and cannot contact anyone by radio. It dawns upon the three that they might be the only survivors in the area, maybe in the world. The domineering Harold takes charge. They concentrate on becoming self-sufficient, and the two men fish, as marine creatures have survived. Later, they also find living insects and baby chicks, presumably newly hatched. Harold feels that in the long run, they will have to move north to a colder climate to avoid problems with insects and food preservation and to increase their chances of meeting other survivors.

Harold asserts ownership of Eve as the husband. Martin reminds him the rules have changed. Eve has never felt love from Harold and was only a possession. She finds freedom. Harold and Martin have a physical fight after Martin has slept with Eve. She tells her husband she was not raped. Harold gives Martin two hours to leave. Eve wants Martin to ask her to come with him and he does. The two leave together and Harold follows in a chase to the boat. Harold beats up and kills Martin. He holds out his hand to Eve and the two go together.