After a traffic accident where ooze was spilled onto four turtles that Splinter took in. In 2003 cartoon, Splinter is the rat pet of Hamato Yoshi until Yoshi's murder. In the 1987 cartoon, Splinter (voiced by Peter Reneday) is Hamato Yoshi, mutated into a mutant brown rat alongside the Turtles, who he rescued from accidentally getting dropped down a storm drain after moving to New York. Splinter is the mutant rat sensei and adoptive father of the Ninja Turtles. Main article: Splinter (Teenage Mutant Ninja Turtles) In most versions, the Teenage Mutant Ninja Turtles are created when four baby turtles are exposed to radioactive ooze, transforming them into humanoids. A D indicates an appearance in deleted scenes only.A P indicates an appearance in onscreen photographs only.A Y indicates an appearance as a younger version of a pre-existing character.A dark grey cell indicates the character was not in the series or film, or that the character's presence in the series or film has not yet been announced.This table shows the recurring characters and the actors who have portrayed them throughout the franchise.4.17 Cudley the Transdimensional Cowlick.