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.

• Morningside Productions
• Columbia Pictures
• William Hopper
• Joan Taylor
• Frank Puglia
• John Zaremba
• Thomas Browne Henry
• Tito Vuolo
• Jan Arvan
• Arthur Space