Molly Monster is going to have a sibling soon, but his good friend Edison is a little bit jealous and worried she might forget about him. When Molly's parents have to travel to the Island where monster parents hatch their eggs, Molly is not allowed to go because she is too young, nonetheless she decides to reach them on her own as soon as she realizes they missed to bring her sibling's gift with them.
| Actor | Role |
|---|---|
| JJasper VogtCaptain (voice) | Captain (voice) |
 Sophie RoisMolly Monster (voice) | Molly Monster (voice) |
 Gerrit Schmidt-FoßEdison / Uncle Santiago / Big Mama (voice) | Edison / Uncle Santiago / Big Mama (voice) |
 Judy WinterMama (voice) | Mama (voice) |
 Klaus-Dieter KlebschPapa / Train Driver (voice) | Papa / Train Driver (voice) |
| TTom EastwoodUncle Alfredo (voice) | Uncle Alfredo (voice) |