When the first manned flight to Venus returns to Earth, the rocket crash-lands in the Mediterranean near a small Italian fishing village. The locals manage to save one of the astronauts Colonel Calder, the mission commander. A young boy also recovers what turns out to be a specimen of an alien creature. Growing at a fantastic rate, it manages to escape and eventually threatens the city of Rome.
William Hopper
as Colonel Robert Calder
Joan Taylor
as Marisa Leonardo
Frank Puglia
as Dr. Leonardo
John Zaremba
as Dr. Judson
Thomas Browne Henry
as Maj. Gen. A.D. McIntosh
Tito Vuolo
as Commissario Unte
Jan Arvan
as Signore Contino - Government Official
Arthur Space
as Dr. Sharman
Bart Braverman
as Pepe
Don Orlando
as Fisherman Mondello (uncredited)
George Khoury
as Fisherman Verrico (uncredited)
Darlene Fields
as Reporter Reynolds (uncredited)
