Disaster has struck! Mini-Maple, Q and Plasma have been sucked up into Henry's most incredible, but most uncontrollable, creation yet: the Mini-Universe.

To save them, the Agency has sent its best and brightest: Mini-Jon (all the other agents were busy). On Byzantine's back, he will explore a parallel universe and travel from a candy planet to a volcanic planet, by way of a cosmic storm and a nebula.

In search of the black hole that will take them home, Mini-Jon and his friends meet a colourful cast of characters.