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Skeleton King is an evil undead warlord / sorcerer.

And is the main antagonist of the series who resides in the Citadel of Bone, a gigantic living spaceship made entirely out of bone filled with nightmarish creatures.

Skeleton King plots to rule the universe starting with The Planet Shuggazoom and is obsessed to find out why Chiro is able to manipulate the Power Primate.

Once The Skeleton King was The Alchemist, a kindly master of the elements of science and magic until he was corrupted by The Dark Ones, a race of Trans-Dimensional demons and became their most loyal servant.

Before he became Skeleton King the Alchemist created the Robot Monkeys to protect The Cosmos from his own Evil.

Skeleton King masterminded key events like the creation of The Pit of Doom and the corruption of The Power Primate to awaken one of The Dark Ones from the Planet Shuggazoom's core.

During the climactic battle, The Skeleton King's decapitated head merged with the unleashed Dark One Worm to become " The Skeleton King Worm " and traveled across the universe transforming once peaceful worlds into desolate wastelands in his wake.

Eventually The Hyperforce ended The Skeleton King Worm's rampage before he could destroy the planet Earth, another target in the Skeleton King Worm's path.

But The Skeleton King's head was recovered from the depth of space by Mandarin and returned to the Planet Shuggazoom.

Under Mandarin's possession, Skeleton King's head was stolen by The Skeletal Circle, The Skeleton King's mortal disciples whose leaders were Ma and Pa Shenko ( Valina's Parents ) who thought to use the head's power to curse Shuggazoom City until they were interrupted by The Hyperforce.

During the battle the Skeleton King's head was split in two revealing a Crystal Skull which was collected by Mandarin and Valina.

It is revealed that The Crystal Skull is one of the elements needed to resurrect the Skeleton King ( along with such objects as The Alchemist's Robe, The Ice Crystal of Vengeance, The Fire of Hate, and The Soul of Evil ) which led Mandarin and Valina to team up and gather the objects across the planet with the Hyperforce in an attempt to stop them.

The search ended in the Pit of Doom ( the place where The Skeleton King lost his original body ) where Valina was successful in resurrecting The Skeleton King in a new form similar to Darth Vader.

Upon his resurrection, he raised a black castle of Formless Ooze within the Pit, which currently serves as a fortress for him and his undead army and plan to wage war " between the living and the dead " on Shuggazoom City.