Help, I Shrunk My Parents

Hilfe, ich hab meine Eltern geschrumpft is a movie starring Oskar Keymer, Lina Hüesker, and Anja Kling. When the wicked headmistress Stingbeard hunts the school, Felix, Ella and their gang set their plan in motion to save the school...
Felix's school is haunted again, only this time it's not the benevolent spirit of school founder Otto Leonhard and the nuisance he caused, but the hated and long-since dead Director Hulda Stingbeard. A coincidence causes the former shrunken and skeletonized school principle to rise again. When she manages to return to real life she almost defeats Otto Leonhard, manages to shrink Dr. Schmitt-Gössenwein and Felix' parents, and takes over the school. It takes Felix, Ella and their gang to set the levers in motion to save the school and bring Dr. Schmitt-Gössenwein and his parents back to their original size again.