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
Joan Taylor
Frank Puglia
John Zaremba
Thomas Browne Henry
Tito Vuolo
Jan Arvan
Arthur Space
Bart Braverman
Don Orlando
George Khoury
Darlene Fields
George Pelling
James Dime
Sid Cassel
Ray Harryhausen
Noel Drayton
Rollin Moriyama