December 16, 2025
Film

Cast Of Help! I Shrunk My Teacher

The 2015 German family-comedy *Help! I Shrunk My Teacher* (original title: *Hilfe, ich hab meine Lehrerin geschrumpft*) brought laughter and wonder to audiences with its playful premise: a student accidentally miniaturizes his strict teacher. Central to its charm is a delightful ensemble cast, blending comedic timing, childlike curiosity, and heartfelt expression. Here’s a deep dive into the actors who breathe life into this whimsical tale.

Main Cast

Oskar Keymer as Felix Vorndran

At the heart of the film is young Felix, played by Oskar Keymer. As the inventive and mischievous student who accidentally shrinks his teacher, he guides viewers through an adventure full of creativity and consequences. Keymer was born in 2003 in Cologne and had already begun acting in German TV before gaining recognition in this role.

Lina Hüesker as Ella Borsig

Felix’s loyal best friend Ella is portrayed by Lina Hüesker. Supportive and brave, Ella helps Felix navigate the chaos that unfolds. Her character adds warmth and teamwork to the film’s dynamic.

Anja Kling as Dr. Adelheid Schmitt‘Gössenwein

The stern but caring teacher, Dr. Schmitt-Gössenwein, is brought to life by Anja Kling. She delivers a charming performance that shifts from fearsome authority to endearing vulnerability after being shrunk.

Axel Stein as Peter Vorndran

Felix’s father, Peter Vorndran, appears in the supporting role played by Axel Stein. His portrayal brings comic relief, depicting a concerned yet humorous dad dealing with extraordinary events at home.

Daniela Preuß as Sandra Vorndran

Sandra, Felix’s mother, is portrayed by Daniela Preuß. Her performance adds a touch of family stability and understanding amidst the whirlwind of miniaturization and schoolyard antics.

Justus von Dohnányi as Schulrat Henning

Playing the role of the school administrator Henning, Justus von Dohnányi adds authoritative presence and humor, interacting with both students and staff in official and comedic capacities.

Otto Waalkes as Otto Leonhard (Spirit of the School Founder)

A surprise delight in the cast is legendary comedian Otto Waalkes, voicing or appearing as the spirit of the school’s founder, Otto Leonhard. He adds a whimsical flair and nostalgic energy to the magical school environment.

Supporting Characters

  • Georg A. Sulzeras Mario Henning, a rival student adding tension and comedic rivalry.
  • Maximilian Ehrenreichas Chris, one of Felix’s friends who joins in on the mischief.
  • Eloi Christas Robert, another peer adding young energy to the group dynamic.
  • Johannes Zeileras Michalsky, the janitor whose role becomes pivotal when the teacher goes missing.
  • Michael Ostrowskias Herr Coldegol, one of the teachers who provides comedic support.
  • Siegfried Fosteras an unnamed investor, appearing in school-related plot points.
  • Christa Schreiberas an elderly rich woman, contributing to school fundraising scenes.
  • Sabine Ludwigas Hulda Stechbarth, who adds to the ensemble of quirky adults.
  • Alexandra Helmigas Ms. Henning, further fleshing out the school environment.
  • Annika Becker & Marie Beckeras investor’s daughters, adding family presence to the story.
  • Joachim Zonsas a construction manager involved in a school project.
  • Basti Johnsonas an African chief in a class play or assembly.

Creative and Technical Team

Director Sven Unterwaldt Jr.

Under the direction of Sven Unterwaldt Jr., the film blends inventive visual comedy with heartfelt moments, successfully bringing a children’s bestseller to life.

Based on Sabine Ludwig’s Novel

The screenplay, adapted from Sabine Ludwig’s 2007 book, was co-written by Gerrit Hermans, Silja Clemens, and Florian Schumacher. Their collaboration ensured the story’s humor and emotional core were preserved.

Supporting Crew

  • Cinematographer: Stephan Schuh shapes the visual world of both normal-sized and miniature perspectives.
  • Editor: Stefan Essl crafts the pacing and comedic timing.
  • Music Composer: Karim Sebastian Elias (also Leland Cox) brings playful, family-friendly themes to life.
  • Costume & Production Design: Birgit Hutter and Bettina Morell create settings and looks that enhance both everyday school scenes and whimsical shrinkage sequences.
  • Producers: Corinna Mehner and Hans Eddy Schreiber oversee the production from Germany and Austria studios.

Chemistry & Performances

The movie’s success hinges on the chemistry between the leads: Keymer brings youthful curiosity, Hüesker provides support and warmth, and Kling delivers both stern authority and empathy. Stein, von Dohnányi, and Waalkes add humor and depth through their portrayals on the adult side. Together, they form an ensemble that balances fantasy, emotion, and fun in a visually inventive narrative.

The cast of *Help! I Shrunk My Teacher* brings a unique mix of talent, energy, and charm to a family-friendly adventure. From Oskar Keymer’s spirited lead performance to Otto Waalkes’s delightful cameo and a host of strong supporting roles, the ensemble makes this German adaptation of Sabine Ludwig’s beloved book a memorable and entertaining watch. With skilled direction, heartfelt writing, and a cohesive cast, the film remains a standout in children’s fantasy comedies.