when the turtles go through the time and fail to claim all the black-hole generator pieces to help in the battle against the triceratons and warn splinter in time to stop shredder from killing him. splinter defeats shredder, somewhat paralyzing him as tiger claw takes him away. when shredder has himself infused with mutagen, he kidnaps karai and demands her to come. splinter fights shredder along with the turtles, and the fight, leading up to rocky crevices and chasms below, splinter and shredder fall into a gaping chasm. shredder's fall stops short as he lands on a rock outcrop as splinter falls way down. he is still alive but his leg is broken. he sees the rat king come toward him, seemingly surviving his fall down as well. meanwhile, the turtles try to find him but shredder goes after them. splinter fights the rat king but soon tumbles down and realizes that his fight with the rat king was all a hallucination because of his fever he had developed in the chasm. he finds the skeletal remains of the rat king and donatello and michelangelo find him, alive and well.