New York Police Department officer Tony Howard has been given Christmas Day off, but he is determined to locate the mutant turtles in the sewers and apprehend them. He is stunned to discover a cutting-edge laboratory that is actually the home of Donatello Hamato, and continues to explore the lab on his own. On the rooftops of the city, Leonardo Hamato is heading to their old family lair, but his brothers inform him that now only Donnie lives there, and Raphael and Renoir live in a new lair of their own. Leo worries about his reclusive brother Donnie, but Michelangelo promises to check in on him. Renoir wants to take a detour of his own, but Raph instructs his pupil to guide the still-injured Mikey down to the sewers. Meanwhile, the turtles are discreetly observed from afar by Karai, the Fo