Prologue: Everything Changes

New York City. A place full of corruption, deceit, and... mutants?
Leonardo, Donatello, Raphael, and Michelangelo have lived in the NYC sewers all their lives. They've trained their bodies so they can avoid detection, and have never shown themselves to humans. That is, until they find a young girl hidden in a dumpster, and they get a taste of the cruelty of the surface.
With a new member of the family to protect, the turtles must rise from the sewers to defend their home from the corrupt forces that seek to destroy it.