An American journalist stationed in Japan is given a mysterious injection by a mad scientist, turning him into a murderous, two-headed monster.
Unfortunately the movie The Manster is not yet available on Disney Plus.
| Directing | George P. Breakston | Director |
| Writing | George P. Breakston | Story |
| Writing | William J. Sheldon | Writer |
| Production | William Shelton | Executive Producer |
| Production | George P. Breakston | Producer |
| Production | Ryuichi Aimono | Producer |
| Production | Robert V. Perkins | Producer |
| Sound | Hirooki Ogawa | Original Music Composer |
| Art | Noboru Miyakuni | Art Direction |
| Costume & Make-Up | Fumiko Yamamoto | Makeup Artist |
| Production | Richard Herbine | Unit Production Manager |
| Production | Yuji Honda | Production Manager |
| Production | C.D. Sykes | Production Supervisor |
| Sound | Chisato Ota | Recording Supervision |
| Crew | Shinpei Takagi | Special Effects |
| Costume & Make-Up | Kazuo Suzuki | Costume Design |
| Editing | Kenneth G. Crane | Editor |
| Directing | Kenneth G. Crane | Director |
| Camera | David Mason | Director of Photography |
| Directing | Dan Takahashi | Assistant Director |
