Lucifer

Lucifer, later known as The Devil or Satan, was an archangel who reigned over Hell due to the machinations of Xena. (XWP: "Heart of Darkness")

Appearances
Lucifer was portrayed by Alex Mendoza in his first appearance, and Joel Tobeck in his second.
 * XWP: "Heart of Darkness"
 * XWP: "You Are There"