Doomwatch

Dr Spencer Quist / Dr. Spencer Quist

Dr. John Ridge

Barbara Mason

Colin Bradley

Tobias Wren

Geoff Hardcastle

Dr. Fay Chantry

Richard Duncan

Pat Hunnisett / Pat Hunisett

The Minister / Minister

Captain - Second Airline Crew / Jenson

Mr. Hetherington / Prisoner Warren

Dr. Anne Tarrant

Barker

Minister

Mrs. Joan Simpson

Major Sims

The Minister

Reporter

Dr. Hugh Preston / Dr. Somerville

Mrs. Knott / Mrs. Smith

Air Hostess / Dr. Gray

Stewardess - Second Airline Crew / Julie

Jim Bennett / Michael Beavis