Jason washes up on the shores of a strange and mysterious land: Atlantis.

The heroes are entangled in the perilous rites of Dionysus with a stranger called Medusa.

Jason and his friends are forced to compete in the perilous sport of bull leaping.

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.

Jason's discovery has blackened his heart, leaving him a shadow of the man he used to be. Reckless and foolhardy, he no longer seems to care about anything or anyone - even Ariadne. Pythagoras is desperate to save his friend, so he sets out in search of help, but soon discovers not everyone is as keen to protect Jason as he is.

The battle between Aeson and Pasiphae for Jason's soul reaches a devastating climax as the warrior is caught by the ruthless queen's soldiers. Jason's friends know they must do all they can to save him before he is lost for ever, and Aeson undertakes a brave and deadly mission into Atlantis to rescue his son. However, he is just one man, and with traitors on all sides plotting to stop him, his chances of success seem slim.