The Turtles are sitting around the farmhouse in Northampton, watching TV. Donatello decides that everyone is becoming couch potatoes and Leo suggests that they should head over to Springfield, a nearby city that will offer them the chance to jump around on some buildings. The guys head out and after an enjoyable night of exploring, they hear some gun shots. As they rush to investigate, they run headlong into a caped crusader - who's been shot in the arm. The man asks the Turtles to trail a truck that he had been staking out while he goes to treat his flesh wound. The TMNT are skeptical, but the fellow shows them a police badge, which convinces most of the guys that they should help. The costumed cop tells the Turtles to meet him at a nearby bridge at dawn.
They eventually uncover an arms ring with the help of the costumed cop.
In the end, Leonardo gives the costumed cop the nickname "Nobody" since he never gave his name.