A flashback sheds light on Adam's family history as he weighs a difficult decision — and Teela begins an important quest. A strange virus grips Eternos.

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?