The Turtle Master is the mentor of the Ninja Rats. He appear in the2003 TV series episode "Turtles in Space, Part 1: The Fugitoid".
The Turtle Master live in the sewers of planet D'Hoonnib, he is the direct counterpart to the mainstream Splinter.
Video game appearances
He made an appearance in the console/PC version of the video game Teenage Mutant Ninja Turtles 2: Battle Nexus. In the game's Battle Nexus Tournament mode, both he and Splinter watch their students fight each other, reminiscing on when they fought each other.