Patrick Thornberry (Baby John Stuart Hodson)
Kimi Tallmadge (Lucy Hodson)
Emma Schlesinger (Tess Hodson)
Cindy Burrows (Alex as a Child)
Glenda Jackson (Alex Greville)
Peter Finch (Dr. Daniel Hirsh)
Murray Head (Bob Elkin)
Peggy Ashcroft (Mrs. Greville)
Maurice Denham (Mr. Greville)
Joe Wadham
Royce Mills
Richard Loncraine (Tony, Bob's Partner)
Russell Lewis (Timothy Hodson)
Frank Windsor (Bill Hodson)
Robert Rietty (Daniel's Brother)
John Rae
Richard Pearson (Middle-Age Patient)
Hannah Norbert (Daniel's Mother)
George Belbin
Caroline Blakiston (Rowing Woman)
Tony Britton (George Harding)
June Brown (Woman Patient)
Marie Burke (Aunt Astrid)
Ellis Dale
Daniel Day-Lewis ([uncredited])
Gabrielle Daye
Edward Evans
Jon Finch (Scotsman)
Ann Firbank (Party Guest)
Harold Goldblatt (Daniel's Father)
Peter Halliday (Her Husband)
Douglas Lambert (Man At Party)
Bessie Love (Answering Service Lady)
Thomas Baptiste (Prof. Johns)
Vivian Pickles (Alva Hodson)