Teenage Mutant Ninja Turtles: Mutant Mayhem Sewer Lair PlaysetEpic Underground Action with TMNT Mutant Mayhem Sewer Lair Playset. Bring the ninja action home with the Teenage Mutant Ninja Turtles: Mutant Mayhem Sewer Lair Playset. Inspired by the hit movie, this multi level lair is packed with hidden features, training areas, and action zonesperfect for recreating epic underground battles and heroic missions. With detailed environments, trap doors, and battle platforms, the set is built for immersive play. Kids