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