An expedition into the interior of Papua New Guinea comes across a tribe of ape-like people who may or may not be ancestors of early man.
| Directing | Gordon Douglas | Director |
| Writing | Vercors | Novel |
| Art | Hilyard M. Brown | Production Design |
| Production | Lee Lukather | Production Manager |
| Editing | John Woodcock | Editor |
| Costume & Make-Up | Edith Head | Costume Design |
| Production | Saul David | Producer |
| Art | George Milo | Set Decoration |
| Camera | Robert C. Moreno | Director of Photography |
| Costume & Make-Up | Jack H. Young | Makeup Artist |
| Production | John W. Hyde | Associate Producer |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Sound | Oliver Nelson | Original Music Composer |
| Sound | Waldon O. Watson | Sound |
| Sound | Frank H. Wilkinson | Sound |
| Sound | Ronald Pierce | Sound |
| Directing | Bill Lukather | Assistant Director |
| Sound | Stanley Wilson | Music Supervisor |
| Costume & Make-Up | Evelyn Coffey | Hairstylist |
| Visual Effects | Albert Whitlock | Visual Effects |
| Visual Effects | Universal Title | Visual Effects |
| Directing | Robert "Buzz" Henry | Second Unit Director |
| Camera | John R. McLean | Second Unit Director of Photography |
| Crew | John Keith McCarthy | Technical Advisor |
| Production | Martin Fink | Associate Producer |
| Crew | Richard Kuhn | Title Graphics |
| Writing | Nelson Gidding | Screenplay |
