*Gil Gerard as Capt. William "Buck" Rogers
- Erin Gray as Col. Wilma Deering
- Thom Christopher as Hawk
- Jay Garner as Admiral Efram Asimov
- Wilfrid Hyde-White as Dr. Goodfellow
- Harry Townes as The Guardian
- Rosemary DeCamp as Buck's Mother
- Paul Carr as Lieutenant Devlin
- Barbara Luna as Koori
- Felix Silla as Twiki
- Shawn Stevens as Boy
- Dennis Haysbert as Helmsman
- Vic Perrin as First Guardian
- Howard Culver as Mailman
- Jeff David as Voice of Crichton (uncredited)
- Bob Elyea as Voice of Twiki (uncredited)
Episode Crew
- Directed by Jack Arnold
- Written by Paul Schneider and Margaret Schneider
- Produced by Calvin Clements Jr., John Mantley, David G. Phinney and John G. Stephens
- Music by Bruce Broughton
- Cinematography by Ben Colman
- Film Editor - Ron Honthaner
- Casting - Joe Reich
- Art Director - William H. Tuntke
- Set Decorator - Frank Lombardo
- Costume Designer - Al Lehman