Splinter, often referred to as Master Splinter or Sensei by his students/sons, is a fictional character from Teenage Mutant Ninja Turtles comics and all related media. A mutant rat, he is the grave and stoic sage of the Turtles, their ninjutsu and martial arts instructor, and their adoptive father. The character was originally a parody of the Marvel Comics character Stick.

Teenage Mutant Ninja Turtles is a 1990 American superhero action comedy film based on the comic book characters created by Kevin Eastman and Peter Laird. It is the first film adaptation of the characters and was directed by Steve Barron and written by Todd W. Langen and Bobby Herbeck from a story by Herbeck. It stars Judith Hoag and Elias Koteas with the voices of Brian Tochi, Josh Pais, Corey Feldman, and Robbie Rist. Teenage Mutant Ninja Turtles follows the Turtles on a quest to save their master, Splinter, with their new allies, April O'Neil and Casey Jones, from the Shredder and his Foot Clan.