Marty finally masters the power of the Fist and has gained the right to receive the chi that Master Zhang has been holding for him after 100 years. He is now ready to face the darkness of evil.

Marty and Ally successfully escape the Iron Tower but Marty begins having nightmares about his real father. He begins to wonder why these visions are happening to him when one of the General's elite warriors appears and fights him. He defeats the enemy but is left unconscious. Will he recover and awaken?

Marty Ally and Violet try to escape but are stopped by Kahn the General's second-in-command. Meanwhile the CDF forces have their hands full in rounding up the Iron Tower employees and guards but are ambushed by the General's forces and forced to retreat as the Iron Tower falls into the hands of the enemy.

Marty finally defeats Eiger and is ready to return when he senses Shadow fighting. He leaves to help leaving Buttons to get to CDF headquarters with the Bullybots. Meanwhile Kahn is starting to question the General's orders and takes matters into his own hands.

Marty and Buttons leave the CDF headquarters in hopes of finding a solution to repairing the Fist of Eon. He returns to Grandmaster Zhang while being chased by the General's forces but the Grandmaster tells him to go to the Temple of the Iron Soul in the middle of the glacier. What is so important about this mysterious temple and who is chasing Marty?

Marty Buttons and Shadow are ambushed by the Four Invincible Lords in the middle of their journey to the Temple. They survive but now they have some new company to worry about the White Monks.

Marty finally faces off against the General. As a formidable opponent Marty is forced to use all of his powers to fight the General. But even with the help of Gaff Shadow and Captain Magnum the fight is not going to be easy. As for Ally she makes it into the Gigantor with the help of Buttons but the transcoder is gone. Will she and Buttons be able to find it and stop Dr. Chen? Will Marty succeed in his quest and destiny as the heir of Eon to take...

When Marty's father sees the Fist of Eon he realizes that the time has come for the General to make his return. Meanwhile Marty must learn to use his newfound powers to save Ally who is under attack by her father's henchmen.

Marty has infiltrated the Tower and is successful in finding Ally but Steeljaw Jack intervenes and prevents him from fulfilling his mission to rescue Ally and bring her back to safety.

Marty is unconscious and everyone is hoping for his recovery especially Ally. Marty's mind gets taken over by the Fist and is now out of control and this forces Chief Gibson to take drastic measures to stop him but is it enough to free Marty from the Fist's control?