Luke Perry
as Dr. Chris Richardson
Tia Carrere
as Lisa Delgado
Peter Fonda
as Dr. Austin Shepard
Lance Henriksen
as Colonel Harlan Williams
Emma Samms
as Laurie Stephenson
Clemency Burton-Hill
as Ginny McKillip
Ronald Pickup
as Dr. Malcolm Handey
Jessica Brooks
as Brooke Richardson
Eliza Bennett
as Haley Richardson
Philip Lenkowsky
as Grant Cole
Marcus Jean Pirae
as Dr. Marshall Peters
Fredric Lehne
as Kenny
Garrett M. Brown
as Mr. Miller