- George D. Wallace
- Commando Cody
- Aline Towne
- Joan Gilbert
- Roy Barcroft
- Retik
- William Bakewell
- Ted Richards
- Clayton Moore
- Graber
- Peter Brocco
- Krog
- Robert R. Stephenson
- Daly
- Don Walters
- Henderson
- Tom Steele
- Zerg
- Dale Van Sickel
- Alon
- Wilson Wood
- Hank
- Noel Cravat
- Robal
- Baynes Barron
- Nesor - Retik's Lab Aide [Ch.2]
- Paul McGuire
- Bream
- Ted Thorpe
- Al's Cafe Bartender [Ch. 6, 7, 12]
- Dick Cogan
- Jones - Dirt-Road Motorist (Ch. 6)
- Joe Bailey
- Policeman #1 at Landing Field [Chs. 1, 3, 8]
- Billy Dix
- Duke - Warehouse Henchman [Ch. 5]
- Claude Dunkin
- Kern - Ray-Gun Agent [Ch. 12]
- Stephen Gregory
- Benson - Garage Owner [Ch. 7]
- Harry Hollins
- Ray-Gun Agent
- Carey Loftin
- Motorist Transporting Pursuit Cop [Ch. 4]
- William Marke
- Lunarium Guard [Ch. 8]
- John Marshall
- Cafe Trucker [Ch. 7]
- Walter Merrill
- Sam - Henchman [Ch. 5]
- Paul Palmer
- Bill - Henchman in Getaway Car [Ch. 4]
- Dick Rich
- Policeman #3 [Ch. 4]
- Sam Sebby
- Moon Scout #7 [Chs. 3, 8]
- Jack Shea
- Guard at Cody Lab [Ch. 11]
- Guy Teague
- Policeman #2 at Landing Field [Chs. 1, 3, 8]
- Ken Terrell
- Stock Footage Henchman
- Arthur Walsh
- Motorcycle Cop [Ch. 11]
