Lance Guest as Alex Rogan

Robert Preston as Centauri

Chris Hebert as Louis Rogan

Kay E. Kuter as Enduran

Dan Mason as Lord Kril

Dan O'Herlihy as Grig

Catherine Mary Stewart as Maggie Gordon

Barbara Bosson as Jane Rogan

Norman Snow as Xur

John O'Leary as Rylan Bursar

George McDaniel as Kodan Officer

Charlene Nelson as Rylan Technician

John Maio as Friendly Alien

Robert Starr as Underling

Al Berry as Rylan Spy

Wil Wheaton as Louis' Friend

Marc Alaimo as Hitchhiker

Vernon Washington as Otis

Bunny Summers as Mrs. Boone

Peggy Pope as Elvira

Peter Nelson as Jack Blake

Suzanne Snyder as Cheerleader

Meg Wyllie as Granny Gordon