 | Natalie Wood als Eva Ryker / Claire Ryker |
 | Robert Foxworth als Norman Hall |
 | Ralph Bellamy als William E. Ryker |
 | Jean-Pierre Aumont als Inspector Laurier |
 | Bradford Dillman als Jason Eddington |
 | Morgan Fairchild als Lisa Eddington |
 | Peter Graves als Mike Rogers |
 | Roddy McDowall als MacFarland |
 | Mel Ferrer als Dr. Sanford |
 | Robert Hogan als J.H. Martin |
 | Tonya Crowe als Little Eva |
 | Vince Howard als Albert Thompson |
 | Ellaraino als Martha Thompson |
 | John Alderson als Sheriff |
 | Len Wayland als Commander Masterson |
 | Ted Gehring als Lt. Galbraith |
 | William Beckley als Leeds |
 | Eric Sinclair als Deck Officer |
 | Keith McConnell als Capt. Blake |
 | John Orchard als Burke |
 | Jorge Cervera Jr. als Gardener |
| John Furlong als Doctor |
| Terrence E. McNally als Launch Helmsman |
 | Peter Kwong als (uncredited) |
| Walter Grauman | Director |
| Laurence Heath | Teleplay |
| Donald A. Stanwood | Novel |
| Irwin Allen | Producer |
| George E. Swink | Associate Producer |
| Richard LaSalle | Original Music Composer |
| Al Francis | Director of Photography |
| John M. Nickolaus Jr. | Director of Photography |
| John A. Fegan Jr. | Editor |
| Duane Alt | Art Direction |
| Stuart A. Reiss | Set Decoration |
| Paul Zastupnevich | Costume Design |
| Richard H. Prince | Second Assistant Director |
| Joseph Musso | Production Illustrator |
| Alan Bernard | Sound Mixer |
| Jerry Jacobson | ADR Editor |
| Marlowe Newkirk | Special Effects |
| Gary Hymes | Stunts |
| David LeBell | Stunts |
| Frank James Sparks | Stunts |
| Janet Gratz | Assistant Editor |
| Donald P. Desmond | Transportation Coordinator |
| George E. Swink | Post Production Supervisor |
| William L. Young | Unit Production Manager |
| Michael Kusley | First Assistant Director |
| Norman Katkov | Story Editor |
| Ed Scheid | Supervising Sound Editor |
| Sid Lubow | Sound Editor |
| Allan R. Potter | Sound Editor |
| Josef von Stroheim | Sound Editor |
| Richard Raderman | Sound Editor |
| Gene Eliot | Sound Editor |
| Abby Marable | Music Editor |
| Art Volpert | Executive Assistant |
| Tony Habeeb | Publicist |
| Jack Baur | Casting |
| M. James Arnett | Stunt Coordinator |
| Joe Falcetti | Property Master |
| Chuck Crafts | Makeup Artist |
| Joe Haley | Makeup Artist |
| Edwin Butterworth | Makeup Artist |
| Darby Hoppin | Hairstylist |
| Sugar Blymyer | Hairstylist |
