The Emperor's New School

The Good, the Bad and the Kronk (2x33)

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When Yzma gives Kronk the assignment of disintegrating Kuzco, Kronk consults his shoulder angel and devil. However, the two of them get into another fight and Kronk tells them to go away. With those two gone, Kronk can no longer make decisions. Yzma then captures his shoulder angel in a cage, and gives the shoulder devil back to Kronk. This causes Kronk to agree with everything the devil says, which causes him to try and disintegrate Kuzco.