Over time, Zorglub has become a friend of Champignac, and is no longer the enemy of old. Yet when he comes to see the Count one morning, he uses his deadly Zorglwave on him - the infamous brain-scrambling ray. Two weeks later, Spirou and Fantasio receive a call for help from their old friend: apparently, there are monsters in Champignac! And when our two fearless adventurers reach the outskirts of the village, they are stopped by an Army blockade...