When high class hooker Nicole is kidnapped from her brothel, Rich businessman Hugo Motherskille hires her ex love Roy Bain to find her. Investigating the disappearance, he eventually finds traces that lead to Dr. Savary, who has produced a strange white powder that's coveted by a race of deformed human beings who live in the underworld in the sewers below the city.
Unfortunately the movie Underworld is not yet available on HBO Max.
| Writing | Clive Barker | Screenplay |
| Directing | George Pavlou | Director |
| Production | Al Burgess | Executive Producer |
| Crew | Richard Perkis | Special Effects |
| Production | Don Hawkins | Producer |
| Costume & Make-Up | Geoff Sharpe | Costume Design |
| Production | Charles Band | Executive Producer |
| Costume & Make-Up | Jeanette Freeman | Key Hair Stylist |
| Sound | Freur | Original Music Composer |
| Writing | James Caplin | Screenplay |
| Costume & Make-Up | Vivien Placks | Makeup Department Head |
| Directing | Peter Freeman | Third Assistant Director |
| Editing | Chris Ridsdale | Editor |
| Directing | Simon Hinkly | First Assistant Director |
| Camera | Sydney Macartney | Director of Photography |
| Writing | Clive Barker | Story |
| Production | Kevin Attew | Producer |
| Production | Graham Ford | Co-Producer |
| Production | Paul Gwynn | Executive Producer |
| Art | Len Huntingford | Art Direction |
| Costume & Make-Up | Peter Litton | Prosthetic Makeup Artist |
| Directing | Paul Frift | Second Assistant Director |
