Help, I Shrunk My Teacher(Hilfe, ich hab meine Lehrerin geschrumpft)

After the eleven-year old Felix (Oskar Keymar) flown by several schools, is now the Otto Leonhard school his last chance. But already the first day there is as little promising. Although he finds in the bustling Ella (Lina Hüesker) quickly a new girlfriend, but its new Director and teacher Dr. Schmitt Gössenwein (Anja Kling) is obnoxious and on top of that the boys in his class are called him above all, the arrogant Mario (Georg Sulzer), not just welcome. To be accepted by them, Felix should be multiple tests of courage. The first is that it breaks in the evening in the school. When attempting to Mrs. Schmitt Gössenwein caught him but all people.