A glowing brain-like creature arrives on a beach near a rocket test site via a teleportation beam. The alien communicates telepathically with the children of scientists. The kids start doing the alien's bidding as the adults try to find out what's happening to their unruly offspring.

Michel Ray
as Bud Brewster

Adam Williams
as Dave Brewster

Peggy Webber
as Ann Brewster

John Washbrook
as Tim

Jackie Coogan
as Hank Johnson

Richard Shannon
as Col. Manley

Raymond Bailey
as Dr. Wahrman

Sandy Descher
as Eadie Johnson

Larry Pennell
as Maj. Thomas

Peter Baldwin
as Mr. James