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Speaking of Orko and Dragoon, I know it was just Filmation being cheap, but I like to think he overthrew Orko's demon friend as ruler of the Dark Dimension.
(It's deeply ironic that after cooperating with She-Ra to get home, Hordak tried to strand her. If he knew she was Adora, he'd do anything to stay together: cf. "Reunions" when he blindly rockets through a dimensional portal after her.)