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.
| Actor | Role |
|---|---|
 Catrin StriebeckMaren Christiansen | Maren Christiansen |
 Oliver KorittkeJustus Reinders | Justus Reinders |
 Gustav Peter WöhlerBürgermeister Tönnings | Bürgermeister Tönnings |
 Hannes HellmannHajo Ehlers | Hajo Ehlers |
 Wilfried DziallasUwe Jensen | Uwe Jensen |
| JJoanna FerkicMilla | Milla |
 Marvin LinkeHenry Ehlers | Henry Ehlers |