Karlson Returns is a continuation of the story where a child, Karlson, returns to a house with his parents, dog, and new mobile Karlson discovers a newspaper article about his revenge plans, which leads to a series of comical events involving a charming ghost, a mischievous cat, and a criminal broom. With the help of his lively imagination and trusted toy ball, Karlson manages to bring happiness back to his life.

Junior, a little boy, befriends Karlson, a mischievous man with superpowers, and together they go on thrilling adventures filled with laughter and joy.