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The Cetacean is called upon to recover a space probe that crashes in the sea, and Mark soon learns that the probe is covered with thousands of tiny alien beings. They intend to learn all they can about the human race by invading host bodies and controlling them. Mark must return them to space before they destroy all humanity.
as Mark Harris
as Dr. Elizabeth Merrill
as Dr. Miller Simon
as C.W. Crawford
as Captain Bracy
as Sid
as Pamela
as Edwin Shirley
as Colonel Manzone