When the villainous Horde Empire returns, the space conquerors look twice as dangerous. This time, Maximo Skulldigg and the rest of the Horde have a tool to sideline the kids' mysterious protector, cosmic knight Trinn Cyclo. To make matters worse, the Horde kidnaps Kaz's parents!

If Kaz and Truly hope to rescue the grown-ups, they'll need all the luck they can get. They'll even need Kaz's catlike, UFO-obsessed uncle, Lucky.