A battle erupts between good and evil when a mysterious traveler embarks on a journey to Subternia. Teela seeks guidance from a trusted source.

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 unhappy 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?