Dr Spencer Quist (40 Episodes)

Colin Bradley (40 Episodes)

Dr. John Ridge (40 Episodes)

Barbara Mason (40 Episodes)

Tobias Wren (40 Episodes)

Geoff Hardcastle (40 Episodes)

The Minister (16 Episodes)

Richard Duncan (7 Episodes)

Captain - Second Airline Crew (2 Episodes)

Barker (2 Episodes)

Minister (2 Episodes)

Mrs. Joan Simpson (2 Episodes)

Major Sims (2 Episodes)

Mr. Hetherington (2 Episodes)

The Minister (2 Episodes)

Prof. Alec Hetherington (1 Episodes)

Norman Sylvester (1 Episodes)

Colonel Archibald Smithson (1 Episodes)

Harry (1 Episodes)

Sen. Connell (1 Episodes)

Lady Janette Holroyd (1 Episodes)

Police Constable (1 Episodes)

Thompson (1 Episodes)

Stephen Grigg (1 Episodes)

Kit Pedler (1 Episodes)

Prof. Hal Symonds (1 Episodes)

Dana Colley (1 Episodes)

Benjamin Fielding (1 Episodes)

Dr. Ensor (1 Episodes)

Dr. Charles Goldsworthy (1 Episodes)

Peter Shipton (1 Episodes)

Old Man (1 Episodes)

John Mitchell (1 Episodes)

Admiral Sir Richard Tranton (1 Episodes)

Tom Reid (1 Episodes)

Geoff Harker (1 Episodes)

Joan Prentice (1 Episodes)

Hilda (1 Episodes)

Chairman of Tribunal (1 Episodes)

Grant (1 Episodes)

Dr. Whittaker (1 Episodes)

Lyon McArthur (1 Episodes)

Priestland (1 Episodes)

Mary Lincoln (1 Episodes)

Dr. Anthony Lewis (1 Episodes)

Tom Hedley (1 Episodes)

Laing (1 Episodes)

Phillip (1 Episodes)

Prof. Fairbairn (1 Episodes)

Reynolds (1 Episodes)

Dr Robert Whitehead (1 Episodes)

BBC Man Houston (1 Episodes)

Scott (1 Episodes)

Miss Sephton (1 Episodes)

'Griff' Griffiths (1 Episodes)

Botting (1 Episodes)

Thomas Prentice (1 Episodes)

Senior House Officer (1 Episodes)

Dennis Pritchard (1 Episodes)

Gerald Marlowe (1 Episodes)

Richard Massingham (1 Episodes)

Sarah Collins (1 Episodes)

Inspector Drew (1 Episodes)

Computer (voice) (1 Episodes)

Dick Burns (1 Episodes)

Bernard Colley (1 Episodes)

Busby (1 Episodes)

Minister's PPS (1 Episodes)

PM's Secretary (1 Episodes)

Michael Pratt (1 Episodes)

Steven Granger (1 Episodes)

Captain Tommy Gort (1 Episodes)

Prof. Miklos Egri (1 Episodes)

Commander Charles Keeping (1 Episodes)

Mrs. Freeman (1 Episodes)

Rev. Charles Garrison (1 Episodes)

Roger Halls (1 Episodes)

Neil Tannahill (1 Episodes)

Meg Tannahill (1 Episodes)

Spencer Quist (1 Episodes)

Luke (1 Episodes)

Captain - First Airline Crew (1 Episodes)

Dr. Patrick (1 Episodes)

Air Commodore Parks (1 Episodes)

Nigel Waring (1 Episodes)

Alexander Drummond (1 Episodes)

Ian Drummond (1 Episodes)

Paola Maria Totti (1 Episodes)

Dr. Mary Bryant (1 Episodes)