When Eternia was young, it was protected by the Ancients, Guardians of the Power. During the first centuries evil emerge in Eternia. Then the Ancients decide to choose an all powerful protector. Ak-thuum was chosen and imbued with all of the ancients power. He fought bravely against all evil enemies of Eternia. But Ak-thuum has so much power that it began to corrupt him. He became unstoppable. The ancients joined once again and open a portal to send Ak-thuum to a timeless place.
This story was told many years after... but like all stories, it became a myth.
Now, The power of the ancients was awaken once more within a few noble warriors. Wun-Dar, King Grayskull and He-man. Ak-thuum has felt the power in Eternia, so he is back to seize it. Able to do some kind of time travel, with unlimited stamina and more power than any other Eternian, He-man and the Masters will need to use all their wits to stop... Ak-Thumm The Corrupted.
Ak-thuum was made of a He-man body, Faceless skirt, head and boots, Dc Doomsday Arms and Marvel Legends Ghost Rider armor.