Ozma and the Queen of Dreams
Ozma hosts a visit from the Queen of Dreams.
Ozma pulled into a gallery of strange dreams, where the paintings are portals to other worlds.
Ozma must find her way through and defeat all of the strange, Wonderland-esque enemies to finally face down the Queen of Dreams.
By shutting down the Emerald Engine, Ozma drives out the Queen of Dreams, but she cannot turn the engine back on.
The dreams flood into Oz, and change things.
Inadvertantly, Ozma has triggered the Clockwork Apocalpyse.