 | Alan Alda als Myles Clarkson |
 | Jacqueline Bisset als Paula Clarkson |
 | Barbara Parkins als Roxanne Delancey |
 | Bradford Dillman als Bill Delancey |
 | William Windom als Dr. Roger West |
 | Curd Jürgens als Duncan Mowbray |
 | Kathleen Widdoes als Maggie West |
 | Pamelyn Ferdin als Abby Clarkson |
 | Curt Lowens |
 | Gregory Morton als Conductor |
 | Janee Michelle als Agency Chief's Girlfriend |
 | Lilyan Chauvin als Woman Writer |
 | Khigh Dhiegh als Zanc Theun |
 | Alberto Morin als Bennett |
 | Berry Kroeger als Raymont |
 | Antoinette Bower als Member of Ely's Group (uncredited) |
 | Walter Brooke als Party Guest (uncredited) |
 | Marta Kristen als Party Guest (uncredited) |
 | Frank Campanella als Detective (uncredited) |
 | Cosmo Sardo als Party Guest (uncredited) |
 | Harry Carter als Pallbearer (uncredited) |
| Paul Wendkos | Director |
| Ben Maddow | Writer |
| Quinn Martin | Producer |
| William W. Spencer | Director of Photography |
| Fred Mustard Stewart | Novel |
| Arthur Fellows | Associate Producer |
| Richard K. Brockway | Editor |
| Jerry Goldsmith | Original Music Composer |
| George Hurrell Sr. | Still Photographer |
| Jakob Gimpel | Musician |
| Moss Mabry | Costume Design |
| Richard Y. Haman | Art Direction |
| Walter M. Scott | Set Decoration |
| Raphael Bretton | Set Decoration |
| Sidney H. Greenwood | Property Master |
| Phill Norman | Title Designer |
| William Eckhardt | Unit Production Manager |
| David Hall | Assistant Director |
| Arthur Morton | Orchestrator |
| Gene Evans | Camera Operator |
| John A. Bonner | Sound Supervisor |
| Don J. Bassman | Sound Re-Recording Mixer |
| Don J. Bassman | Sound Mixer |
| Daniel C. Striepeke | Makeup Supervisor |
| Joe DiBella | Makeup Artist |
| Pat Abbott | Hairstylist |
| Charlie Picerni | Stunts |
