Also starring : Arthur O'Connell, Bob Hastings, Byron Webster, Carol Lynley, Charles Bateman, Eric Shea, Ernest Borgnine, Gene Hackman, Jack Albertson, Jan Arvan, ...

Also starring : Gene Sheldon, George J. Lewis, Guy Williams, Henry Calvin, Jan Arvan, John Dehner, Tony Russel, Britt Lomond, Romney Brent, Than Wyenn, ...

Movie Plot : A spacecraft which returns from the first manned flight to Venus, crashes into the sea and releases a small monster that accidentally crawled aboard. The monster however proves to be a dangerous Ymir, and when the animal becomes an adult, it threatens to attack Rome.

Genre : Science Fiction

Also starring : William Hopper, Joan Taylor, Frank Puglia, John Zaremba, Thomas Browne Henry, Tito Vuolo, Jan Arvan, Arthur Space, Bart Braverman, ...