Mankind attains longevity through gene manipulation, but finds itself on the road to extinction when the species loses the ability to reproduce. Their clones who rebelled 1,600 years ago are now known as Marigans and rule the bottomless underworld. Some of them seem to have become fertile and the government takes this as a ray of hope and decides to send civilians in to carry out an ecological study. Selected for the mission, Parton sets off on an adventure through a subterranean labyrinth crawling with monsters in order to secure humanity’s future.
Unfortunately the movie Junk Head is not yet available on HBO Max.
| Art | Takahide Hori | Art Direction |
| Sound | Takahide Hori | Sound Editor |
| Crew | Takahide Hori | Cinematography |
| Editing | Takahide Hori | Editor |
| Visual Effects | Takahide Hori | Animation |
| Sound | Takahide Hori | Original Music Composer |
| Art | Takahide Hori | Set Decoration |
| Visual Effects | Yuji Sugiyama | Visual Effects |
| Production | Yoshinori Enomoto | Executive Producer |
| Production | Kent Yoshida | Producer |
| Sound | Takahide Hori | Music |
| Crew | Emily Balistrieri | Translator |
| Sound | Yoshiki Kondo | Music |
| Visual Effects | Takahide Hori | Visual Effects |
| Production | Yuichi Nakao | Executive Producer |
| Directing | Takahide Hori | Director |
| Writing | Takahide Hori | Screenplay |
| Writing | Takahide Hori | Story |
