- Sylvia Anderson
- Melody Angel
- Ed Bishop
- Captain Blue
- Gary Files
- Captain Magenta
- Cy Grant
- Lieutenant Green
- Donald Gray
- Colonel White / Captain Black / Voice of the Mysterons (voice) (archive footage)
- David Healy
- (voice) (archive footage) (credit only)
- Janna Hill
- Symphony Angel / Intercontinental Airlines Tannoy (voice) (archive footage)
- Martin King
- Delta-Tango 19 Co-Pilot
- Francis Matthews
- Captain Scarlet
- Paul Maxwell
- Captain Grey / World President / Fire Chief (voice) (archive footage)
- Elizabeth Morgan
- Destiny Angel / Rhapsody Angel / Harmony Angel (voice) (archive footage) (as Liz Morgan)
- Charles 'Bud' Tingwell
- Dr. Fawn / Captain Brown / Lieutenant Dean / Spectrum Helicopter A-42 Pilot / Spectrum London Headquarters / Airport Operator / Agent 042 / Fairfield (voice) (archive footage) (as Charles Tingwell)
- Lian-Shin Yang
- (voice) (archive footage) (as Lian-Shin) (credit only)
- Jeremy Wilkin
- Captain Ochre / Human Captain Black / Delta Garage Attendant / Radio Voice / Director General of the United Asian Republic / Director General's Double / Jackson (voice) (archive footage)
- Neil McCallum
- Delta-Tango 19 Pilot / Airport Controller (voice) (archive footage) (uncredited)
