However, the Waynes and Olin are not part of the war game. They have used Neff to construct 4 cases, in addition to the 48 ordered by the naval officers, and smuggled their own portable nuclear weapon into the United States. With less than 48 hours before the bomb's scheduled detonation at 3 p.m. on Tuesday, Williams and his team track Buzz Olin and the Waynes to the San Francisco area. After a desperate attempt to escape with the bomb and destroy San Francisco by air, Leo Wayne is killed and Jackson has just two hours to attempt to defuse the bomb while Williams flies towards Nevada. This fails and with less than a minute to go the bomb is dropped from the plane to detonate over Frenchman Flat at the Nevada Test Site. Crisis averted, the film ends with the narrator intoning, "...and three o'clock is just the middle of another afternoon in the life of a city." Cast John Ireland as SID agent John Williams Richard Denning as SID chief Paul Reagan Suzanne Dalbert as Margo Wayne Robert Foulk as Commander Jackson Mike Connors as Ensign Magrew (credited as "Touch Conners") Richard Avonde as Buzz Olin William Bryant as FBI Agent in Montage (as William R. Klein) Cicely Browne as Blonde Woman (as Cicely Brown) Tommy Farrell as Agent Reynolds Joseph Mell as Box of Taffy Man at Penn Station Robert Hunter as Andy - alias Andre Peter Marshall as Leo Wayne Production director of photography Lester White, A.S.C. art director Paul Palmentola film editor William A. Lyon, A.C.E. set decorator Louis Diage assistant director Milton Feldman sound engineer George Cooper musical director Mischa Bakaleinikoff certificate number 16329 Western Electric recording produced by Sam Katzman associate producer Charles H. Schneer References External links Review of film at Variety 1953 films 1950s action thriller films American black-and-white films American spy films American crime thriller films American action thriller films Cold War spy films Columbia Pictures films Films about nuclear war and weapons Films directed by Fred F. Sears Films produced by Sam Katzman Films set in Nevada Films set in Washington, D.C. Films set in New Mexico Films set in Connecticut Films set in Marseille Films set in San Francisco 1950s English-language films 1950s American films