After Sumsemann the beetle loses one of his arms to a troll, he invites brother and sister Peterchen and Annaliese to join him on a journey to the moon in a quest to retrieve his lost arm.
Vicky is the only son of Halvar, the formidable viking chief. Vicky renounces violence but nevertheless he is able to convince the seasoned viking warriors to take him along on their voyages. In dangerous situations, where their bravery and force are not quite enough to master the situation, the wild-eyed warriors learn to rely on Vicky's cleverness.
