With the Horde's evil plan in place, Skeletor learns the truth about his past. Duncan and Orko seek an old friend's help to enhance the Sword of Power.

A conflicted Adam wrestles with regret as Man-At-Arms, Teela and other allies race to defend Eternia, erupting in a violent confrontation.

Magic and tech spark chaos in a climactic battle for Castle Grayskull. Can our heroes — and a selfless act — restore hope for Eternia's future?