Apart from the series, there was also a comic book series by DC Comics.
Had the series continued, the writers considered adding another Centurion: Ace's space specialist brother, Vic.
The characters all had alternate names considered:
- Max Ray: Max Proteus, Jack Finn, Scuba Ford, Sean Finn, Sharky Finn, or George Striper
- Jack Rockwell: Nat Stone, Arnold Stone, Terry North, "Demon" Frazier, Slate Rockwell, or Butch Moran
- Ace McCloud - Harrison McCloud, Bert Sky, "Mach" McCloud, Glenn Peters, Anthony Flyte, or Benjamin Flyte.
- Rex Charger: Rex Powers or Storm Larsen.
Max Ray's appearance was based on that of the title character of "Magnum (1980)." He also resembles Olympic gold-medalist swimmer Mark Spitz.