Trapped on the other side of the barrier, Uma is more desperate than ever to get her long-awaited revenge against Mal. When she discovers an underground lair belonging to Hades, god of the underworld, Uma realizes she's found the perfect partner in crime. Together, they can defeat Mal, bring down the barrier, and escape the Isle for good.
Mal and Uma have a score to settle, and they'll come face to face in an explosive underwater battle that could determine the fates of Auradon and the Isle of the Lost once and for all.