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 |
| Sound | Andreas Wölki | Sound |
| Production | Elke Ried | Producer |
| Production | Anja Dihrberg | Casting |
| Production | Ole Kampovski | Producer |
| Production | Thorsten Flassnöcker | Producer |
| Costume & Make-Up | Bea Gossmann | Costume Design |
| Writing | Katja Kittendorf | Writer |
| Writing | Michael Holzinger | Writer |
| Production | Angelika Paetow | Producer |
| Editing | Sebastian Thümler | Editor |
| Camera | Felix Cramer | Director of Photography |
| Art | Stefan Schönberg | Production Design |
