After the Wicked Witch tricks the Wizard into sharing his powers for an Oztember celebration, Dorothy and her friends must stop her from making the change permanent.

Wilhelmina casts a "Say Yes" spell on the Wicked Witch for her attitude. Her auntie starts to try things she would never have agreed to before. When the Wicked Witch changes to be upbeat, Wilhelmina must figure out how to reverse the spell.