Helena, a woman living a seemingly ordinary life, hides a dark secret—her father is the infamous 'Marsh King', the man who kept her and her mother captive in the wilderness for years. After a lifetime of trying to escape her past, Helena is forced to face her demons when her father unexpectedly escapes from prison.
Unfortunately the movie The Marsh King's Daughter is not yet available on HBO Max.
| Production | Cliff Roberts | Executive Producer |
| Production | Robert Simonds | Executive Producer |
| Production | Charles Miller | Executive Producer |
| Production | Adam Fogelson | Executive Producer |
| Production | John Friedberg | Executive Producer |
| Writing | Mark L. Smith | Screenplay |
| Production | Samuel J. Brown | Executive Producer |
| Writing | Elle Smith | Screenplay |
| Production | Michael Heimler | Executive Producer |
| Writing | Karen Dionne | Book |
| Production | Michelle Wade Byrd | Casting |
| Costume & Make-Up | Anne Dixon | Costume Designer |
| Camera | Alwin H. Küchler | Director of Photography |
| Production | Mary Vernieu | Casting |
| Art | Tim Grimes | Production Design |
| Costume & Make-Up | Faye Crasto | Makeup Artist |
| Art | James Dardenne | Art Direction |
| Costume & Make-Up | Jordan Samuel | Makeup Artist |
| Costume & Make-Up | Michelle Côté | Hairstylist |
| Costume & Make-Up | Michelle Côté | Hair Designer |
| Costume & Make-Up | Lukas Press | Hairstylist |
| Costume & Make-Up | Jordan Samuel | Makeup Designer |
| Costume & Make-Up | Anthony Veilleux | Tattoo Designer |
| Costume & Make-Up | Michelle Côté | Hair Department Head |
| Camera | Brendan Adam-Zwelling | Still Photographer |
| Editing | Naomi Geraghty | Editor |
| Sound | Biko Gogaladze | Foley Artist |
| Production | Lori Fischburg | Unit Production Manager |
| Production | Charles Miller | Unit Production Manager |
| Directing | Urs Hirschbiegel | First Assistant Director |
| Sound | Adam Janota Bzowski | Original Music Composer |
| Crew | Amy Szoke | Stunts |
| Directing | Mark Romanelli | Second Assistant Director |
| Crew | Brian Jagersky | Stunt Coordinator |
| Production | Clementine Quittner | Associate Producer |
| Production | Christopher Guzman | Post Production Coordinator |
| Production | Teddy Schwarzman | Producer |
| Production | Mark L. Smith | Producer |
| Directing | Neil Burger | Director |
| Production | Keith Redmon | Producer |
