| Kurt Russell | Jungle Boy |
| Billy Curtis | Bottom Half of Knight |
| Bob D'Arcy | Robot |
| Booth Colman | Scientist #1 |
| Chick Hearn | Radio Announcer |
| Danny Klega | Ivan |
| Denny Miller | Duke Williams,Tongo |
| Don Rickles | Norbert Wiley |
| Edward Little Sky | Headhunter #1,Witch Doctor,Haruki |
| Frank Corsentino | Native #1 |
| Hans Conried | Wrong Way Feldman,Wrongway Feldman |
| Harold J. Stone | Alexi Gregor Dubov |
| Henny Backus | Mother |
| Janos Prohaska | Ape,Spider |
| Jim Lefebvre | Kupaki Headhunter #1 |
| John McGiver | Lord Beasley Waterford |
| Larry Storch | Jackson Farrell |
| Les Brown | Bingo |
| Mel Blanc | Voice Only |
| Midori | Kilani |
| Nehemiah Persoff | Pancho Hernando Gonzales Enrico Rodriguez |
| Patrick Ryan Denver | Young Gilligan |
| Phil Silvers | Harold Hecuba |
| Richard Kiel | Ghost |
| Rory Calhoun | Jonathan Kincaid |
| Rudy LaRusso | Michaels |
| Russ Grieve | Headhunter,Chief,Native #2 |
| Russell Thorson | Gen. Bryan |
| Sandra Gould | Telephone Operator |
| Stanley Adams | King Killiwani |
| Sterling Holloway | Burt |
| Strother Martin | George Barkley |
| Tina Louise | Eva Grubb |
| Tom Forstor | Executioner |
| Vito Scotti | Dr. Boris Balinkoff,Japanese Soldier |
| Walt Hazzard | Air Force Lieutenant |
| Zsa Zsa Gabor | Erika Tiffany Smith |
| Al Ferrara | Kupaki Headhunter #2 |
| Bartlett Robinson | Hartley |
| Bert Madrid | Jose |
| Charles Maxwell | Robot |
| George Neise | NASA Official |
| George Patterson | Bango |
| Harold Sakata | Ramoo |
| Harry Lauter | Maj. Adams |
| Harry Swoger | Prison Guard |
| Herb Vigran | Voice Only |
| Jack Sheldon | Lucky |
| Larry Thor | Scientist #2 |
| Michael Forrest | Ugandi |
| Michael Whitney | Johnny |
| Mickey Morton | Native #1 |
| Mike Mazurki | Olaf |
| Roman Gabriel | Headhunter #2 |
| Vincent Beck | Igor |
| Allen Jaffe | Headhunter #3 |
| Arthur Peterson | Scientist #3 |
| Ed Wade | Bongo |
| K.L. Smith | Gates |
| Kirk Duncan | Parsons |
| Mary Foran | Daughter |
| Mike Reece | Native #1 |
| Paul Daniel | Native #3 |
| Pete Sotos | Kupaki Headhunter #3 |
| Robert Swimmer | Native #2 |
| Scott Graham | Astronaut Tobias |
| Bill Hart | Native #2 |
| Jim Spencer | Astronaut Ryan |
| Kirby Johnson | Irving |
| Louis Quinn | Hank |
Technical Credits
| Abner Biberman | Director |
| Alan Crosland | Director |
| Charles Norton | Director |
| Christian Nyby | Director |
| David Orrick McDearmon | Director |
| Gary Nelson | Director |
| George Cahan | Director |
| Hal Cooper | Director |
| Herbert Coleman | Director |
| Ida Lupino | Director |
| Jack Arnold | Director |
| Jerry Hopper | Director |
| John Rich | Director |
| Lawrence Dobkin | Director |
| Leslie Goodwins | Director |
| Michael Kane | Director |
| Ray Montgomery | Director |
| Richard Donner | Director |
| Robert Scheerer | Director |
| Rodney Amateau | Director |
| Stanley Z. Cherry | Director |
| Steve Binder | Director |
| Tony Leader | Director |
| Wilbur D'Arcy | Director |
