Casey is a student teacher who gets his very first placement in class 5b. He is not sure how to teach yet, but thankfully the children are more than willing to help him.

Class 6b is going camping, led by Mees Kees and Principal Dreus. But after Dreus strains her back all responsibility suddenly rests on the shoulders of Kees. When things go wrong, he begins to doubt himself. But he soon learns that it is not about making mistakes, but about how to solve them.

The big end-of-term play is approaching. Tobias is somewhat anxious, but with Mees Kees at the helm, everything should be just fine. The class looks forward to rehearsing in the afternoons and to making beautiful scenery - until they find out that Principal Dreus has chosen a terribly boring medieval play. Moreover, it is to be staged in a dusty room within a nearby retirement home. But Mees Kees wouldn't be Mees Kees if he didn't put his own twist on things...

The fourth movie about the popular teacher Mees Kees.

Mees Kees goes on a hot air balloon adventure.

In this new installment, Mister Twister faces a major challenge as he has to stand on his own. While continuing to inspire his students with creative teaching methods, he deals with changes both at school and in his personal life. The strict principal keeps him on his toes, and his students never fail to surprise him in their own unique ways. Filled with humor and heartwarming moments, the film shows how Mister Twister, despite the obstacles, always manages to bring out the best in his class.