By mistake F&F drink an elixir of Prof. Knox and shrink. This makes Lupo a serious danger for them. Lupo has built a chess computer, but it has other ambitions and would rather fly through space with Lupo's rook as a rocket. F&F and Lupinchen sail on the water and are suddenly caught in a whirlwind - they find themselves on an island, but Lupinchen has disappeared. Daddy wants a raise and therefore invited his boss for dinner. Unfortunately he forgot to inform his family.