Richard Todd
Wing Commander Guy Gibson, V.C., D.S.O., D.F.C.

Michael Redgrave
Doctor B. N. Wallis, C.B.E., F.R.S.

Ursula Jeans
Mrs. Wallis

Basil Sydney
Air Chief Marshal Sir Arthur Harris G.C.B., O.B.E., A.F.C.

Patrick Barr
Captain Joseph (Mutt) Summers, C.B.E.

Ernest Clark
Air Vice-Marshal The Hon. Ralph Cochrane G.B.E., K.C.B., A.F.C.

Derek Farr
Group Captain J. N. H. Whitworth, D.S.O., D.F.C.

Charles Carson
Doctor

Stanley Van Beers
Sir David Pye, C.B., F.R.S.

Colin Tapley
Doctor W.H. Glanville, C.B., C.B.E.

Frederick Leister
Committee Member

Raymond Huntley
Official, National Physical Laboratory

Hugh Manning
Official, Ministry of Aircraft Production

Edwin Styles
Observer at Trials

Hugh Moxey
Observer at Trials

Laurence Naismith
Farmer

Nigel Stock
Flying / Off. F. M. Spafford, D.F.C., D.F.M.

Brian Nissen
Flt / Lt. A. T. Taerum, D.F.C.

Robert Shaw
Flt / Sgt. J. Pulford, D.F.M.

Richard Leech
Squadron Leader H. M. Young, D.F.C.

Richard Thorp
Squadron Leader H. E. Maudslay, D.F.C.

John Fraser
Flight Lieutenant J. V. Hopgood, D.F.C.

Bill Kerr
Flight Lieutenant H. B. Martin, D.S.O., D.F.C., A.F.C.

George Baker
Flight Lieutenant D. J. H. Maltby, D.S.O., D.F.C.

Denys Graham
Flying Officer L. G. Knight, D.S.O.

Tim Turner
Flight Lieutenant J. F. Leggo, D.F.C.

Ewen Solon
Flight Sergeant G. E. Powell

Harold Goodwin
Wing Comdr. Gibson's Batman

Patrick McGoohan
Guard at door (uncredited)

Peter Arne
Staff Officer to Air-Vice Marshal Cochrane (uncredited)

Peter Diamond
Tail Gunner (uncredited)

Gerald Harper
RAF Officer (uncredited)

Arthur Howard
RAF Pay Clerk in NAAFI (uncredited)

Lloyd Lamble
Collins (uncredited)

Philip Latham
Flight Sergeant (uncredited)

Edwin Richfield
RAF Officer (uncredited)