After Caz injures his leg pretending to be a Galactic Guardian, the Scientists of Primus give him a high-tech Medi-Suit powered by energy crystals that can help him move around until his leg is fully healed. This Medi-Suit gives Caz some abilities. Knowing that the Scientis of Primus put too many energy crystals in it, Master Sebrian advises He-Man to stop Caz before he gets hurt. Unfortunately Skeletor lures Caz to a trap on the planet Dectis causing He-Man, Sagitar, and Tuskador to go rescue him.

Den Mutanten ist es gelungen, Primus zu erobern. Noch hält sich die Freude der hinterhältigen Invasoren in Grenzen, denn He-Man hat sich in den Untergrund flüchten können. Dort leistet er den Eroberern erbitterten Widerstand.