Big man, he has Atom Bombs for breakfast! Split Second is directed by Dick Powell and written by William Bowers, Irving Wallace and Chester Erskine. It stars Stephen McNally, Alexis Smith, Jan Sterling, Keith Andes, Arthur Hunnicutt, Richard Egan, Paul Kelly, Robert Paige and Frank DeKova. Music is by Roy Webb and cinematography by Nicholas Musuraca. Escaped convict Sam Hurley (McNally) is on the run with his wounded pal Bart Moore (Kelly) and henchman accomplice Dummy (DeKova). Carjacking two lots of hostages, Hurley takes them to a ghost town on an Atom Bomb test sight figuring it's the…