Pierrot and Dickie have completed their training as spaceship pilots and are now looking forward to new challenges. Soon, the two arrive for their first mission, which is to identify an unknown flying object.

An unknown flying object appears on the radar. Pierre, Pierrette, and Maestro discuss where it might come from and whether it might be hostile.

The representatives of the confederation, chaired by the President, are now to vote on how to deal with the unknown flying object. There is no consensus at all!

The new recruits of the Milky Way security force arrive for training. Pierrette is worried about Fat Nose's threatening behavior. Meanwhile, the UFO enters the ship's observation space. This calls for immediate action!

Now things are getting serious: The crew is getting ready to launch, and the two young pilots are eager to go along for the ride. Will they be able to persuade their fathers to let them?

The crew of Starship Hummingbird are doing everything they can to make contact with the unidentified flying object. Will they be successful?

Leipzig, 1989: Twelve-year-old Fritzi lovingly looks after a little dog belonging to her best friend, Sophie, who has apparently gone on summer vacation with her family in Hungary. But when Sophie doesn’t return in the fall, it becomes clear that her family actually fled to West Germany. Fritzi courageously sets out to return Sputnik to Sophie… and gets caught up in a movement that’s changing the future of the country.

Aunt Dete brings Heidi to the beautiful Alpine village of Dörfli to live with her grandfather, Alm-Öhi. But there are many rumors going around about him, and Heidi doesn’t exactly receive the warmest welcome from the local children.

Heidi and Josef comes across what appears to be a little dog caught in a trap, and try to help it. But the townspeople are certain that there are hungry wolves roaming the area…

When Peter catches Karl and his pals bullying Heidi in the meadow, he challenges him to a climbing competition on Eagle Rock. How will it end?

Peter invites Heidi into his tree house, where the two of them swear to eternal friendship.

What was supposed to be a fun afternoon in the cave with Josef and Pieple turns into a total nightmare when Heidi gets lost in the fog. Fortunately, Grandfather arrives just in time.

Karl discovers that a fossil has been taken from his collection. He accuses Heidi and Peter—but the culprit turns out to be someone else.

Heidi and her grandfather ride a sled through the valley — it’s her first time, and she loves it! Peter, meanwhile, is having a rough time in class, and the teacher isn’t going easy on any of the students today.

Peter and Heidi are shocked to see that Karl, Theresa, and Willi have taken over their tree house. But then Heidi hatches a plan to get them out…