Anjulie XL (Excalibur)

Anjulie coerced the king of an alien planet to let her rule at the behest of the king's daughter. After becoming ruler, she quickly became tyrannical treating her subjects, the king, and the princess as things to be experimented with. The princess led a coup against Anjulie and when she was cornered one of our heroes accidentally teleports on top of the princess saving Anjulie. Thinking the tyrant needed saving he quickly dispatches her pursuers. Anjulie and the hero spend some nights sleeping together but the hero becomes suspicious when she treats her servants poorly and spies on her. It's revealed she's making some kind of monster. The hero's allies show up while he frees the princess. The princess punches Anjulie and before she can retaliate, one of the hero's allies stabs her in the back, ending her rein.