*Gil Gerard as Capt. William "Buck" Rogers
- Erin Gray as Col. Wilma Deering
- Tim O'Connor as Dr. Elias Huer
- Ann Dusenberry as Ariela Dyne
- Jay Robinson as Cassius Thorne
- Anne Jeffreys as Prime Minister
- Felix Silla as Twiki
- Mel Blanc as Voice of Twiki
- Antoinette Stella as Jayel
- Wendy Oates as Renna
- Liberty Godshall as Nyree
- Darrell Zwerling as Macon
- Teddi Siddall as Linea
- Wally K. Berns as Major Norris
- James Faracci as Karsh
- William Conrad as Voice of Narrator
- Ron Gans as Voice of Mr. DeBronin (uncredited)
- Sean Garrison as Flight Controller (uncredited)
- Eric Server as Voice of Dr. Theopolis (uncredited)
Episode Crew
- Directed by Philip Leacock
- Written by D.C. Fontana and Richard Fontana
- Produced by Jock Gaynor, Medora Heilbron, Bruce Lansbury, Glen A. Larson, David J. O'Connell and David G. Phinney
- Music by Michael Melvoin
- Cinematography by Ben Colman
- Film Editor - George Potter
- Casting - Phil Benjamin
- Art Directors - Hub Braden and Fred Luff, III
- Set Decorator - Frank Lombardo
- Costume Designer - Al Lehman
Production Management
- Harker Wade - Unit Production Manager
Second Unit Director or Assistant Director
- Bob Bender - First Assistant Director
- Gerald T. Olson - Second Assistant Director
Art Department
- Jerry Allen - Model Builder
- Ted Wilson - Carpenter (uncredited)
Sound Department
- Earl Crain, Jr. - Sound
- Dick Wahrman - Sound Effects Editor