Lupo wants to make a good impression when dancing and secretly tries out the latest invention by Professor Knox - a hair restorer. Unfortunately, the result is not at all to Lupo's liking and with the help of Fix and Foxi he desperately tries to get rid of the huge amount of hair. Grandma Eusebia wants to offer rooms for rent in her house. The first guests are already at the door. But the baron and his granddaughter are tricksters who only target grandma's jewelry. Fix and Foxi quickly find that out, but Grandma doesn't want to believe it. So with Lupinchen's help, the brothers themselves have to put a stop to the crooks. Everyone is at the fair and has fun. But then Hinki and Stinki block the roller coaster with a huge magnet and pull the money out of people's pockets. It actually works fine, but Fix and Foxi will not let them get away with that. The children find old science fiction comics in the attic. Dad warns the children to stay away from the comics so they don't get nightmares. Suddenly a green moving thing appears that looks like a Martian.