 | Peter Tompkins als The Investigator |
| Will Knickerbocker als Lt. Cmdr. Whorley |
| Fred Buch als Dr. Asper |
| Jack Nagle als Consul Gottschalk |
 | John Lawrence als Ensign #1 |
| Phil Goble als Ensign Cain |
| Jim Marsh als Executive Officer Forbes |
| Dave Kraul als Ensign Hoffman |
 | Lou Colombo als Murderer |
| Jim Hess als Capt. Robert Lindquist |
| Robert Garrison als Co-Pilot Hill |
| Janet Raney als Stewardess Mary Burke |
 | Michael W. Schwartz als Controller |
| Víctor Villa als Aviation Chief |
| Jerry Mann als Dan Burak |
| Ray Crawford als Father Horgan |
| Gregory Bayless als Sgt. Robert Gallivan |
| John Dodson als Pfc. YoYo Gruebel |
| Timothy Miller als Pfc. Joseph Delman |
| Eric Henshaw als Lt. Taylor |
| Harry Frank Porter als Duty Officer |
| Steven Uzzel als Lt. Robert Cox |
| James R. Geeting als Capt. Edward Powers |
 | Charles Lucia als Dinner Key #1 (as Chip Lucia) |
 | Randy Stone als Dinner Key #2 |
| Joe Bernardoni als Controller #1 |
| Roger Gorton als Controller #2 |
| Alan Landsburg | Producer |
| Howard Lipstone | Executive Producer |
| Marilyn Lassen | Producer's Assistant |
| Steven Jones | Assistant Camera |
| Carol L. Fleisher | Researcher |
| J. Barry Herron | Director of Photography |
| Tony Francesco | Gaffer |
| Charles Guanci | Assistant Property Master |
| Paul Desatoff | Additional Photography |
| Tom Coll | Set Dresser |
| Dave Wyman | Researcher |
| Art Schwab | Production Manager |
| Jack Dunsmoor | Post Production Coordinator |
| Laurin Rinder | Original Music Composer |
| Laurin Rinder | Orchestrator |
| J.B. Jones | Property Master |
| Janet Baulzer | Script Supervisor |
| Christina Friedgen | Post Production Supervisor |
| Mark Clark | Post Production Coordinator |
| Lloyd Nelson | Editor |
| W. Michael Lewis | Original Music Composer |
| Brianne Murphy | Director of Photography |
| Perry Jones | Key Grip |
| Donald Brittain | Director |
| Joe Roveto | Wardrobe Assistant |
| Roni Seinfeld | Production Assistant |
| Alan Landsburg | Story |
| Jo-Dee Mercurio | Wardrobe Assistant |
| George B. Hively | Editor |
| Donald Brittain | Screenplay |
| Barbara Wegher | Associate Producer |
| Vivian Cocheo | Wardrobe Assistant |
| Bob Ames | Production Controller |
| Ken Jones | Assistant Camera |
| John Boisseau | Sound |
| Francis Mauldin | Wardrobe Assistant |
| Laura Steckel | Production Assistant |
| Jim Kouf | Researcher |
| Brian Donnelly | Production Coordinator |
| Elaine Gregory | Production Secretary |
| J. Barry Herron | Camera Operator |
| Donald Brittain | Producer |
| Kay Hoffman | Production Supervisor |
| Roger Daniell | Sound |
| Bill Voigtlander | Assistant Editor |
| Glenna Rubinson | Production Assistant |
| Lewis Lipstone | Production Assistant |
| José Louis Mignone | Additional Photography |
