 | Sidney Poitier als Dr. Matt Younger |
 | Ester Anderson als Catherine Oswandu |
 | Yvette Curtis als Stefanie Younger |
 | George Baker als Dr. Henry Barlow |
 | Johnny Sekka als Dr. Joseph Myomo |
 | Earl Cameron als Ambassador George Oswandu |
| Hilary Crane als Marsha Barlow |
| John Beardmore als Burberry Detective (uncredited) |
 | Milos Kirek als General Kuznovski (uncredited) |
| Letta Mbulu als Club Singer (uncredited) |
 | T.P. als Man (uncredited) |
| James Payne als Taxi Driver at Theatre (uncredited) |
 | Lon Satton als Man (uncredited) |
 | Guy Standeven als Party Guest (uncredited) |
 | Rudolph Walker als Man (uncredited) |
| Sidney Poitier | Director |
| Paul Beeson | Director of Photography |
| Pembroke J. Herring | Editor |
| Peter Pitt | Editor |
| Melville Tucker | Producer |
| Coleridge-Taylor Perkinson | Original Music Composer |
| Lawrence Roman | Writer |
| Miriam Brickman | Casting |
| Doreen Soan | Continuity |
| Elliot Scott | Art Direction |
| Harold Melvin | Hairstylist |
| W.T. Partleton | Makeup Artist |
| Tony Brubaker | Stunt Double |
| David Tomblin | First Assistant Director |
