MIGHTY MAX Episodes 1 and 2: Pandora's Box (Season 2)

With Skullmaster's Crystal of Souls broken, the former ruler of the Earth's core Lava Lord is released from his prison. He plans to retake his kingdom from Skullmaster with a giant robot called Magus. Meanwhile, Max is getting tired of never being able to have fun because of his duties as the Mighty One. Virgil agrees that he can give up saving the world if he goes on one last quest to strike at Skullmaster while he's weakened. Once in the underworld, Virgil is captured by Skullmaster's minions. Because of a prophecy that they're destined to die together, he attempts to forge an alliance with the fowl.
Lava Lord meets Skullmaster's forces with Magus, but thanks to Virgil's tactical advice Lava Lord is knocked out of his robot, which allows Max and Norman to hijack it. They head to Skull Mountain to get to the bottom of Virgil's betrayal. Although suspicious of Virgil at first, Max realizes that his partnership with Skullmaster was a complex ploy to let Max get his hands on Magus. However, Skullmaster uses Virgil as a shield, and Max refuses to kill Skullmaster at the cost of Virgil's life. Instead, he allows Skullmaster and Warmonger to escape to the Earth's surface with them.