cast
- Cliff Robertson
- Charly Gordon
- Claire Bloom
- Alice Kinian
- Leon Janney
- Dr. Richard Nemur
- Lilia Skala
- Dr. Anna Straus
- Dick Van Patten
- Bert
- William Dwyer
- Joey
- Dan Morgan
- Paddy
- Barney Martin
- Hank
- Ruth White
- Mrs. Apple
- Frank Dolan
- Eddie
- Ralph Nelson
- Convention speaker
- Skipper McNally
- Gimpy
crew
- Ralph Nelson
- Director, Producer
- Stirling Silliphant
- Screenwriter
- Arthur Ornitz
- Cinematographer
- Ravi Shankar
- Composer (Music Score)
- Frederic Steinkamp
- Editor
- John De Cuir
- Production Designer
- Charles Rosen
- Art Director
- Selig J. Seligman
- Executive Producer
- Daniel Keyes
- Short Story Author
- Lynn H. Guthrie
- Second Assistant Director
