The city of Levitan is in need of more berillium to run its generators. Master Sebrian's old friend Treybius travels to Primus to deliver the berillium where his ship the Star Trader is intercepted by the Evil Mutants. After being rescued by the Galactic Guardians, Treybius accompanies He-Man, Master Sebrian, and the Galactic Guardians to Denebria to reclaim the Star Trader and get the berillium before Levitan crashes to the ground.