Fathers & Sons (S05E09)

After facing a challenging encounter with the latest Shredder, the Turtles feel disheartened about their chances of victory. In an effort to restore their confidence, Splinter and the Ancient One reminisce about the Turtles' early years. Their tale uncovers a remarkable adventure from when the Turtles were just toddlers, showcasing how they bravely confronted a ghost intent on resurrecting the Shredder, a feat they’ve long since forgotten. This story serves to inspire the Turtles and reignite their fighting spirit.