The War for Oz( A Penn Zero Part Time Hero/ Dorothy Must Die crossover)

Takes place after 'End of All Worlds'. Penn, Sashi, and Boone enter their sophomore year of high school. Everything is alright for the trio, especially for Penn Zero. He finally got his parents back from the most dangerous world imaginable and got a great girlfriend in the form of Sashi. Things get weird however, when a new girl transfers into Middleburg Central High, and doesn't like Penn the slightest. Penn knows there's something off with the girl, but what is it? And why does she seem familiar to someone he's seen on tv? What Penn doesn't know is that the girl wants something from the used to be part time hero. Something that Penn never knew he had.

Get ready. The war for Oz is coming.