Living at the Hamburg docks is tough,
A gang of rats has the harbor under its strict control. Leader Rattila believes he is making the town a better place for all. In reality, it is mostly his family that benefits, especially his ruthless son Bratterick and spoiled daughter Rattelique. They cheat, steal, and stab each other in the back.
Who would dare to stand up to them? The Muscleteers! The daring street mouse Ernie, the well- educated hamster Bertram, the slightly ponderous house-mouse Picandou and the smart lab rat Josephine work together to help the citizens.
From their top-secret base in a local delicatessen shop, our heroes stage their magnificent missions and life-saving rescues. The four stay true to their motto: one for all, all for one!