Visionaries: Knights of the Magical Light

The Overthrow of Merkylnn (1x9)

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Darkstorm formulates a plan to get rid of Merklynn and steal his magic. It all turns out as planned and Darkstorm becomes an all-powerful sorcerer. However, he accidentally unleashes the Apocalypse, so they must go back to Merklynn as their last hope of saving the world.