Rat King is one of the most common foes of the Teenage Mutant Ninja Turtles, but each incarnation of him is wildly different from the other.

In the 2003 Teenage Mutant Ninja Turtles cartoon, Splinter returns and is depicted as a devoted father and mentor to the Turtles. Unlike the comic, this version of Splinter has him as the pet rat ...

Splinter, Casey Jones, a Foot Clan Ninja, and the Shredder are here ... of Splinter back when he was a hyper-intelligent rat who had not yet been exposed to the mutagenic ooze, as well as the ...