- Released on November 23, 1961 (UK) | May 1962 (USA)
- B&W (with tinted sequences)
- Running time: 99 minutes
- Production Co.: Val Guest Productions
- Distribution Co.: British Lion (UK)| Universal-International (USA)
- Directed by Val Guest
- Written by Val Guest and Wolf Mankowitz
- Starring: Janet Munro, Leo McKern, Edward Judd
- When the U.S. and Russia unwittingly test atomic bombs at the same time, it alters the nutation (axis of rotation) of the Earth.
- THE PICTURE THAT GIVES YOU A FRONT SEAT TO THE MOST JOLTING EVENTS OF TOMORROW...TODAY! (original U.S. print ad - all caps)
- The INCREDIBLE becomes Real! The IMPOSSIBLE becomes Fact! The UNBELIEVABLE becomes True!
- Never leave atomic bombs where children can reach them.