Felix's school is haunted again, only this time it's not the benevolent spirit of school founder Otto Leonhard and the nuisance he caused, but the once hated and long-since dead Director Hulda Stingbeard. A coincidence causes the former shrunken and skeletonized school principle to rise again, leading to chaos...

A sperm donor becomes impotent - and so he searches for the woman, who got his sperm, to become a father after all...

Once again, 16-year-old Jonas starts at a new school and, as always, he has no intention of being anybody’s darling. Jonas has muscular dystrophy, is confined to a wheelchair and knows that he will die sooner rather than later from this incurable and progressive disease. His mother Alma, who raises Jonas alone and would rather take a second job than forego therapy for him, is determined to delay his deterioration. She has placed Jonas with Dr. Wildenhahn, an authority on Duchenne disease. The doctor manages to be taken seriously by Jonas, that is until he gets to know Emily, Marianne Wildenhahn's daughter, who goes to his class. Emily has a massively low academic grade, which she hides from her mother because of the doctor’s high standards. Emily falls in love with Jonas, and her sincere affection gives him the courage to love her back. Emily and Jonas become a couple, overcoming all obstacles.

57-year-old Hilde likes to lead the way - both in her family and at work. That's why she regrets having failed with her own restaurant years ago. Now she may be making her umpteenth new start at the Quincy's burger chain, but she remains true to herself: she only sticks to rules that make sense to her! When Hilde is dismissed by the branch manager, her own son Tommie, she puts all her eggs in one basket: together with her two friends, whom she already had on her team as canteen manager in GDR times, Hilde wants to take over the sports hall and offer home-made burgers there - not ordinary hamburgers, but "McLenBurgers"!

Already having a hard time adjusting at his new school, things take a turn for the bizarre for eleven year old Felix when he accidentally shrinks his strict principal to only fifteen centimetres in height!

19-year-old Fiadh spends a night in Berlin's nightlife - oscillating between her sugar daddy Marcel and her boyfriend Micha.

Empathy is a two-edged sword, especially for Martin. Tormented by the past, haunted by the present, the chief inspector is a brilliant investigator and, together with his team, solves the most convoluted cases. From kidnapping to hostage situations, to murder. Unable to eat or sleep until a case is solved, they all take their toll.

Impoverished former soprano Anneliese Behrens is forced to leave her house and collapses in an underground passage, when looking for a place to sleep. In the hospital, she learns that she suffers from a brain tumor and needs 24-hour attention. Although they have maintained no contact with each other, she will be hosted by her daughter, who, however, has already booked a Christmas vacation with her family in Thailand. The only solution is to take her mother with her.

Melanie is a new pupil at the Otto Leonhard High School, and Felix takes a real shine to this newbie, much to the annoyance of Ella and Felix’s gang. They believe that Melanie is responsible for a number of small thefts that have been happening at the school since she arrived. Events take a drastic turn when the class goes on a school trip...