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)
John Chard
Why is it always, always so costly for Man to move from the present to the future? 20 Million Miles to Earth is written by Bob Williams and Christopher Knopf from an original treatment by Charlott Knight. The film was produced by Charles H. Schneer's Morningside Productions for Columbia Pictures ...