Catastrophe! Mini-Bulle, Julien-Christophe and Plasma were sucked into the grandest, but also the most uncontrollable creation of Henry: The mini-universe! To rescue them, the Agency sent its best element: Mini-Jean (all the other agents were busy). On the back of Byzantine, he will discover a parallel world and travel from a candy star to a volcanic planet through a cosmic storm and a nebula. In search of the black hole that will take them home.