Richard Todd (Wing Cmdr. Guy Gibson)
Michael Redgrave (Dr. Barnes N. Wallis)
Stanley van Beers (Sir David Pye)
Ursula Jeans (Mrs. Wallis)
Derek Farr (Group Capt. J.N.H. Whitworth)
Raymond Huntley (Official from Ministry of Aircraft)
Patrick Barr (Capt. Joseph Summers)
Anthony Shaw (R.A.F. Officer at Trials)
Edwin Styles (Observers at Trials)
Hugh Moxey (Observers at Trials)
Laidman Browne (Committee Member)
Brian Nissen (Flt/Lt. A.T. Taerum)
Denys Graham (Flying/Off. L.G. Knight)
Eric Messiter (Committee Member)
Frank Phillips (BBC Announcer)
Robert Shaw (Flight Sgt. Pulford)
Patrick McGoohan (Guard on Door)
Ewen Solon (Flt/Sgt. G.E. Powell)
Frederick Leister (Committee Member)
Bill Kerr (Flight Lt. Martin)
Harold Siddons (Group Signals Officer)
Harold Goodwin (Crosby)
Richard Leech (Sqd Ldr. H.M. Young)
Charles Carson (Doctor)
Colin Tapley (Dr. W.H. Glanville)
Richard Thorp (Sqd Ldr. H.F. Maudslay)
Tim Turner (Flt/Lt. J.P. Leggo)
Basil Appleby (Flt/Lt. R.C. Hay)
Laurence Naismith (Farmer)
Brewster Mason (Flt/Lt. R.D. Trevor-Roper)
Anthony Doonan (Flight Lt. Hutchison)
Nigel Stock (Flight Lt. Spafford)
George Baker (Flight Lt. Maltby)
John Fraser (Flight Lt. Hopgood)
Basil Sydney (Sir Arthur Harris)
Ernest Clark (AVM Ralph Cochrane)