David Graham
Parker / Wilbur EDandridge III / Captain Hanson (voice), Gordon Tracy / Brains (voice)
Shane Rimmer
Scott Tracy (voice), Reactor Control Assistant (voice)
Sylvia Anderson
Lady Penelope Creighton-Ward (voice)
Ray Barrett
Colonel Harris / Colonel Benson (voice), Jansen (voice), John Tracy (voice), Dr. Orchard (voice), Atom Sub Reefer Captain / TV Reporter (voice), Deborah, Duchess of Royston / Brophy / Fireflash Co-Pilot / Percy's Friend (voice)
Matt Zimmerman
Lieutenant Jensen (voice), Press Officer / 2nd Reporter (voice), Hector McGill (voice), TV Reporter (voice), Atom Sub Reefer Lieutenant (voice), Banino / Macklin / Foreign Lieutenant (voice), Alan Tracy (voice), Franklin / Gutierrez (voice), 2nd Croupier / Hendricks (voice)
John Tate
Various Characters (voice) (uncredited), McColl / Security Guard (voice) (uncredited), Solarnaut Camp (voice) (uncredited), Maxie / Scheiler / Foreign Colonel (voice) (uncredited), Frank Hooper / Sir Harry (voice) (uncredited), Blackmer (voice) (uncredited)