A tornado brings magician Oscar Diggs to Oz, where he teams up with the good witch Glinda to try to save the land of Oz from being taken over by her two evil sisters.

After Cassie leaves her backpack at the arcade, Ant-Man helps his daughter by shrinking them both and sneaking into the place, but when they decide to go into a pinball machine and Cassie gets stuck, the hero must rely on his ants for help.