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.

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?