Zandor and the Herculoids are plagued by a strange series of invisible incidents as they are entangled and then they start disappearing. Zandor suspects the Flying People and the king says that his son is behind the incident but doesn't know where the invisibility powers come from. Guest-star Space Ghost arrives to reveal that a Magnetite meteor came out of a black hole: its radiation causes invisibility and the king's son got hold of it. Space Ghost takes the meteor away and Zandor drives off the rebellious son.