Peter UstinovDirector
Ralph RichardsonProf. Heatherville
Raymond HuntleyProf. Laxton-Jones
John LaurieDr. McVitie
Ernest JayDr. Dainty
David TomlinsonMr. Watlington
Finlay CurrieSir Duncan Wills
Richard AttenboroughJack Arnold
Marjorie RhodesMrs. Arnold
Pamela MatthewsMrs. Watlington
Joan HaythorneMrs. Laxton-Jones
Joan YoungMrs. McVitie
Ann WiltonMrs. Dainty
Edward LexySir Desmond Prosser
David HutchesonSquadron Leader Sowerby
Patrick WaddingtonGroup Capt. Aspinall