...dass Euch da kein Licht aufgeht!.

Beppo Bastelmann and his dog Bolli Spürnase track down Wattfraß. He is hiding in a kitchen where numerous electrical appliances are switched on. When Beppo and Bolli find him here, the electricity devil flees on the streetcar and escapes into the room of a thoughtless employee who has surrounded himself with numerous heaters and lamps. Wattfraß feels at home here and sings his little song of joy. But Beppo and Bolli track him down and don't let him escape again.