Martin chooses three boys to go on the mountaineering expedition, and Rocky, at least, is immediately enthusiastic about the idea. However, Martin withholds one important detail from them at first...

Eylin tells us more about the trees that can be found in Germany. She also gives us a few simple pointers on how to recognize them, and tells us why she thinks people like trees so much.

Schotty is still waiting to start work and watching the TV in the lobby to pass the time. Meanwhile, strange things seem to be going on all around him, with many familiar faces.

Here's one for lovers of trees and forests. Eylin introduces the most common types of tree found in Germany and also tells us about the interesting history of the country's forests.

Lisa asks a friend from her university days for help, but he is not enthusiastic about her idea to organize an expedition up to the Gran Paradiso.

How has the beginning of the year 2023 been in Germany? Paula summarizes the most important events clearly and understandably for you.

Our delicious-looking humans have been on this planet for a dangerously long time, and for some of the dinosaurs, the temptation is just too great. Will Pierrot and his friends manage to get to safety in time?

Lisa is reprimanded by her superior because of the promise she made to Mark.

In this part, we find out how it all began and why extreme swimming is not the way to go if you are mainly interested in exercising to look good.

Pierrot talks to the head of the reptilian species and learns some interesting details about their way of life. The little robot shows enthusiasm for their team sport, and the crew discusses whether the species would be suitable candidates to join their confederation.

André Wiersig is not your average swimmer who just goes to his local swimming pool. This is a man who likes to push the boundaries of what is humanly possible, swimming out in the open seas without any protection from the cold.

Having requested a second opinion on his condition, Mark has received the results of the assessment in the mail. When he is finally alone, he opens the envelope with trembling fingers...

Pierrot, Dickie, and Metro become acquainted with the inhabitants of the planetoid Lagos, although the "big lizards" are initially not entirely at ease with these two-legged visitors...

Pierrot and Dickie share the command on this expedition and finally land on the planet Lago, where they are immediately spotted by the inhabitants...

Lisa initiates contact with Mark, but he proves to be his usual prickly self and then ends up taking things a little too far.