An atomic scientist is found floating in a river with a bullet in his back and a radioactive halo around his body. The radioactivity has put him seven-and-a-half seconds ahead of us in time. He teams up with a reporter to stop his evil double from destroying his experiments in artificial tungsten.

Gene Nelson
as Mike Delaney

Faith Domergue
as Jill Rabowski

Peter Arne
as Dr. Stephen Rayner / Jarvis

Joseph Tomelty
as Detective Inspector Cleary

Donald Gray
as Robert Maitland

Vic Perry
as Emmanuel Vasquo

Paul Hardtmuth
as Dr. Bressler

Martin Wyldeck
as Dr. Preston

Leonard Williams
as Detective Sergeant Haines

Launce Maraschal
as Editor (Alcott)