Austin Willis

as Dr. Fleming, Space Command

Andrew Anthony

as Dr. Joseph Edmunds, Space Command Mission Control

Bob Barclay

as Frank Anderson, XSW1

James Doohan

as Phil Mitchell, XSW1 Engineer

Aileen Taylor

as Ilene Morris, Space Command Communications

Harry Geldard

as Steve Cassel, XSW1 Captain

William Shatner

Joe Austin

Cec Linder

as (1953)