The End (Duo-Franchise Arc)

The End is the final arc in the High School quadrilogy and the entire series

The End Part 1
Zachary has been a solo act for years but when the biggest mystery is finally revealed, he must pull out all the stops to defeat their oldest foe as he recruits Aiden Romero, Piper, Meeko, former mayor-turned renegade Gale J. Griffin, his cohorts Bunny and Ruthless, Slipknot, the henchangels: Clint Garrison, Wes Kintaro and Mordecai Delightful, Zachary's noncorporeal sister Lily Loud, Kiko, Master Splinter, the Miraculous Holders and Denham to assist him in saving the world.

The End Part 2: Firestorm
Though Sherman is finished, the Grizzly Empire has a surprising new leader: Ice Bear. Zachary will have to do whatever it takes to defeat Ice Bear even if for it means fighting his other rogue best friend Perry the Platypus who still thinks Zachary is the villain. In addition, the members of the group have either been killed or made corporeal so Zachary and his sister will have to become the heroes of their own story and maybe get a dash of fame or two.