Ariadne – now queen and in an epic war against Pasiphae's army – turns to Jason, Hercules, and Pythagoras for help. The time has come for Jason to fulfill his destiny. The battle for Atlantis has begun.

Atlantis is set to fall as Pasiphae continues her siege on the city. The last hope rests with Jason, Hercules, and Pythagoras. Hercules makes a discovery that throws into doubt everything he once knew to be true.

Ariadne is formally crowned queen of a still-vulnerable Atlantis. An enigmatic stranger arrives offering salvation. As Jason fights for glory on the tournament ground, Ariadne embarks on her own private battle.

As Ariadne lies on her deathbed, Jason embarks on a dangerous quest into the unknown. After a daring encounter with the ancient Grey Sisters, Jason's mission brings him face to face with Medea and Pasiphae once more.