1983 MOTU/POP Filmation Animated Series Canon:
Deemos was a powerful sorcerer in the days of Eternia's past. He and Tyrella ruled the City of the Ancients. Using their magic to live unnaturally long lives, they knew time was against them and created the Masks of Power to extend their mortality.
During Prince Adam's time, two young wizards named Aran and Oona wanted to join Skeletors band of evil warriors. They found the masks and foolishly put them on, causing them to instantly transform into Demos and Tyrella. They are eventually defeated when the Sword of the Ancients is joined with the Sword of Power.
1983 MOTU Filmation Animated Series Appearances: