Jeremy Wilkin

Kellman

Virgil Tracy (voice)

Inspector Ronet

Gordon Maxwell / Skydiver Navigator Lt. Gordon Maxwell

Virgil Tracy / Space Exploration Center President (voice)

Dr. Tulliver / Richards

Dev Tarrant

Virgil Tracy / Hogarth (voice)

Human Captain Black / Delta Garage Attendant / Radio Announcer (voice) / Captain Ochre / Director General Xian Yoh / Director General's Double (voice) / Captain Ochre / 3rd Policeman / 5th Policeman / Radio Announcer (voice) / Captain Ochre / Guard 2 (voice) / Lieutenant Burroughs / Radio Announcer (voice) / Pilot (voice) / Morton / Distillery Attendant (voice) / Captain Ochre / 2nd Medical Student / Radiographer (voice) / Dr. Giadello (voice) / Captain Ochre / Barman (voice) / Captain Ochre / Lookout Warden (voice) / Control (voice) / Colonel Storm / Robot (voice) / Andre Verdain / Commissionaire (voice) / Jackson (voice) / Captain / Security Man (voice) / Shroeder (voice) / Angelini (voice) / Captain Ochre / Dr. Kurnitz / Human Captain Black (voice) / Kinley (voice) / Major Gravener (voice) / Captain Ochre / Reporter Harry (voice) / Dr. Denton / Spectrum, New York (voice) / Rhodes (voice) / Dr. Sommers (voice) / Captain Ochre / Tribune Control Operator (voice) / Captain Ochre (voice) / Senior Cadet Joe Johnson (voice) / 3rd Policeman / Shroeder (voice)

Doctor

James Nolan

Artillery Officer

Ralph Clayton (voice)

Insp. Lars Bergen

The Bishop / Various Characters (voice)

Geoff

Dr. Melplash

Army Captain

Gidney

Tom Pocock

Self