Will Milla and her friends be able to save the seal "Knopfauge" and the seal station from the greedy Hajo Ehlers? Ironically, Ehler's son Henry, whom Milla knows from school and doesn't like, turns out to be a great help.
Unfortunately the movie Der Seehund von Sanderoog is not yet available on HBO Max.
| Directing | Klaus Wirbitzky | Director |
| Writing | Katja Kittendorf | Writer |
| Writing | Michael Holzinger | Writer |
| Production | Thorsten Flassnöcker | Producer |
| Production | Ole Kampovski | Producer |
| Production | Angelika Paetow | Producer |
| Production | Elke Ried | Producer |
| Camera | Felix Cramer | Director of Photography |
| Editing | Sebastian Thümler | Editor |
| Sound | Andreas Wölki | Sound |
| Costume & Make-Up | Bea Gossmann | Costume Design |
| Art | Stefan Schönberg | Production Design |
| Production | Anja Dihrberg | Casting |
