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It's late at night, nearing midnight, when Leonardo leads his brothers — Raphael, Donatello, and Michelangelo — across the New York City rooftops on patrol, when a light clank is heard from a nearby alleyway.

Leonardo gestures sharply, and all four descend into the alley's mouth, Leonardo drawing his katanas, Raphael spinning his sais, Donatello holding his bō staff, and Michelangelo holding his nunchaku at the ready.

"Who's there?" Leonardo calls.