Once before, the ravishing lake mermaid Undine has warned her lover Raoul. Their humid-romantic fairy-tale love is in danger because Raoul's brother wants to destroy the pristine mountain lake idyll with an ambitious hotel project. Undine defends her paradise. She is alluring, but also perverse and unpredictable. She can give a lot of love, but she can also kill.
Unfortunately the movie Undine is not yet available on HBO Max.
| Writing | Eckhart Schmidt | Writer |
| Production | Eckhart Schmidt | Producer |
| Sound | Joseph Hölderle | Music |
| Editing | Eckhart Schmidt | Editor |
| Costume & Make-Up | Sibilla Pavenstedt | Costume Design |
| Art | Udo Karohl | Art Department Manager |
| Crew | Maria Lusia Pino | Special Effects |
| Production | Susann Kristin Friedrich | Unit Manager |
| Production | Edith Götsch | Unit Manager |
| Production | Karl Margraf | Production Manager |
| Production | Anja Schmidt-Zäringer | Production Manager |
| Sound | Albrecht Harms | Sound Recordist |
| Sound | Michael Kranz | Sound Mixer |
| Sound | Angelika Krämer | Dialogue Editor |
| Costume & Make-Up | Susanne Kalwa | Wardrobe Designer |
| Editing | Andreas Treske | Assistant Editor |
| Directing | Werner Kiefer | Continuity |
| Camera | Philipp Geigel | Assistant Camera |
| Camera | Anette Haellmigk | Assistant Camera |
| Camera | Michael Praun | Clapper Loader |
| Camera | Ronald Simoneit | Still Photographer |
| Directing | Eckhart Schmidt | Director |
| Camera | Bernd Neubauer | Director of Photography |
