The Strange Mission of the Space Cruiser Ares Lieut. John Grimes, officer on the space ship Ares, arrives at the planet El Dorado with his shipmates on a mission of mercy. The men and women of that fabulous planet, who have almost but not quite achieved immortality, are in immediate danger of extinction. The men are infertile and the ladies are getting out of hand Lieut. Grimes and his cohorts, who only want to help, are suddenly in deadly peril.