Alfred is a very diligent night watchman at the pasta factory. However, working the night shift means that he is unable to do his day job, mayor in little town nearby. He asks professor Balthazar to help and the professor makes a robot that can help Alfred.

Bim and Bum are two friends with an extraordinary job: to make holes, ready for use anytime somebody needs a hole. Sievemakers, buttonmakers and cheesemakers all need holes to do an excellent product. Bim and Bum can even make a hole for a railroad tunnel. But professor Balthazar must rescue them when they and their work shop fall into a hole in the ground.

Young Tom borrows his father's medical kit to visit the zoo and cure the sick animals. Willy is a cowardly tiger, Abdullah the camel has a broken hump, Archia the bear is depressed and Koko the elephant has something stuck in his trunk. When it is believed that Mickey the lion has eaten Tom, professor Balthazar is asked for help.

In the annual city festival there is a prize contest for best achievement. Professor Balthazar competes with a machine that produce a beautiful rainbow. The professor modifies the machine slightly in order for the machine to produce rainbow colored cloth for the unhappy tailor who only cares for making doll's clothes.

As the little river through the city runs dry, the miller is out of business and it becomes pointless to go fishing. All that is left are the frogs. Professor Balthazar succeeds in scaring away all the frogs, except one singing frog who becomes something of a mascot for the city.

Sylvester is an amazing tailor who can make clothes for anybody. But lately his business has been suffering because of his sister Vivianne whose horrendous singing makes it impossible to create his trademark clothing.

Professor Balthazar's friend Johan works at the zoo, carrying ice to the polar bears' cage. A village outside the professor's city is threatened by an avalanche but thanks to one of the professor's machines the avalanche is sucked up by the machine and instead used for the benefit of the polar bears.

Friendly aliens from a distant planet arrive in professor Balthazar's city, fascinated by the fact that humans have hair on top of their heads. Discreetly they take hair from people's dolls to use for themselves. Professor Balthazar travel to the alien planet to help the aliens.

The inhabitants of a neighboring city suffers from the summer's heat and drought. Professor Balthazar help them out by developing a cloud radar, then traveling to England where he finds a cloud that agrees to place itself above the city.

Professor Balthazar's friend Hugo suffers from clumsiness. Unable to hold a job or attend dancing lessons, his only friends are the bears that enjoys Hugo's trumpet playing. The professor develops a solution to help his friend.

The clock tower is out of order which leads to confusion in professor Balthazar's city. People oversleep or work through the night since they do not know the time. The clock is replaced but its grinding noise makes people grumpy and annoyed. Professor Balthazar turn things right again.

The first snowfall is eagerly anticipated and when it finally falls, the people of professor Balthazar's city make the most of it with building snowmen of all kinds. The city council decide to buy snow from the South pole to build the world's largest snowman. But as the spring sun starts to melt the snowman, the city needs the professor's help to save the city from the flooding.