Teenage Mutant Ninja Turtles (2012) (2012)

S05E17 Monsters Among Us

Upon their return to modern-day New York City, the Turtles and Renet are shocked to discover a city overrun by a horde of undead creatures. As they delve deeper into the chaos, they come to the unsettling realization that their actions may have inadvertently exacerbated the crisis.