Queen of the Crown
The Queen of the Crown is the head of a vast and crumbling empire. We see instances of Crown conquests and atrocities in "Tortuna" where it is explained that she destroyed virtually all of Tortuna's population outside of a handful of domed cities. In "Queen's Lair," she enslaves the planet Wollcam and manufactures a gigantic gun that blasts a hole in the moon, attempting to ransom Earth for 5000 human lives.
The Queen is an accomplished sorceress who often uses technology to make her considerable power all the more vile. Her psychocrypt and mind-link with the Slaverlords is but one example. In "Mindnet," she takes control of an experimental telepathy booster, which is later used in "Battle of the Bands" to control the minds of thousands of sentients attending a rock concert. Perhaps her most bone-chilling accomplishment was a machine that used Eliza's psychocrystal for power. It not only threatened to kill Eliza, but subjected Zachary to a form of mental torture. Driven to near insanity by the combination, he made a suicidal attempt to break into the Queen's palace. He was quickly captured and turned into a Slaverlord himself. The other three Rangers were able to rescue him, and the machine was rendered useless, but Eliza was never rescued during the series.