as the second season progresses, splinter tells the turtles about his true relationship with karai. he is able, eventually, to convince karai of the truth about their past, but she subsequently mutates into a snake-like being when shredder's plan for revenge backfires. later, earth is invaded by the kraang and, in the ensuing battle, much of splinter's lair is destroyed before splinter is able to defeat kraang sub-prime. splinter then leaves the lair to find his missing sons. splinter again engages shredder in battle and, seemingly victorious, splinter prepares to reunite with his sons, april, and casey jones, only to be attacked from behind by shredder and thrown into a sewer drain. he is rescued from drowning by karai and left in an area of the sewer to recover.