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.
| Actor | Role |
|---|---|
 Michel RayBud Brewster | Bud Brewster |
 Adam WilliamsDave Brewster | Dave Brewster |
 Peggy WebberAnn Brewster | Ann Brewster |
| JJohn WashbrookTim | Tim |
 Jackie CooganHank Johnson | Hank Johnson |
 Richard ShannonCol. Manley | Col. Manley |
 Raymond BaileyDr. Wahrman | Dr. Wahrman |
 Sandy DescherEadie Johnson | Eadie Johnson |
 Larry PennellMaj. Thomas | Maj. Thomas |
 Peter BaldwinMr. James | Mr. James |
 Ty HungerfordSentry | Sentry |
 Russell JohnsonJoe Gamble | Joe Gamble |
| DDavid BairSaul Wahrman | Saul Wahrman |
 Johnny CrawfordKen Brewster | Ken Brewster |
 John BensonSentry | Sentry |
| HHelen JayMother | Mother |
 Burt MetcalfeGuard | Guard |