Guy Williams's first movie.
The idea for the film came from atomic scientists and the first scripts raised questions about the use of the new weapon against Japan and all uses of nuclear energy in the future. By the time the Pentagon and the White House got through with it, the movie took a 180-degree turn. President Truman even got the actor playing him in the movie fired - Greg Mitchell author of 'Atomic Cover-Up: Two U.S. Soldiers, Hiroshima & Nagasaki, and the Greatest Movie Never Made'.