Editing Splinter (Teenage Mutant Ninja Turtles) (section)

==Mirage Comics, original films, 2003 cartoon, 2023 film==
In both the [[Teenage Mutant Ninja Turtles (Mirage Studios)|original comics]] and the [[Teenage Mutant Ninja Turtles (film series)|live-action movies]], Splinter is a pet of a ninja named Hamato Yoshi in [[Japan]], and uniquely intelligent for his species. Yoshi becomes embroiled in a deadly dispute with a fellow ninja by the name of Oroku Nagi and is eventually murdered in turn by Nagi's brother, [[Shredder (Teenage Mutant Ninja Turtles)|Oroku Saki]], as revenge for his brother's death. However, in the [[Teenage Mutant Ninja Turtles (1990 film)|1990 film]] and [[Teenage Mutant Ninja Turtles (2003 TV series)|2003 TV series]] Nagi is removed entirely. Additionally, in the 1990 film, Splinter escapes from his cage during the murder, and attacks Saki, clawing at his face. Saki, in turn, slices his ear off. It is suggested that this mutilation is the reason Saki took the Shredder disguise to hide the scars. In contrast, in the 2003 TMNT cartoon series, it was [[List_of_Teenage_Mutant_Ninja_Turtles_characters#Hun|Hun's]] face which Splinter clawed.

Without a home, Splinter is forced to run away and live in [[New York City]]'s sewers. Due to a traffic accident, four baby turtles and a canister of mutagenic ooze are sent down into the sewer. The canister mutates both Splinter and the turtles; it also enhances the former's already sophisticated intellect. Splinter names the four turtles [[Leonardo (Teenage Mutant Ninja Turtles)|Leonardo]], [[Donatello (Teenage Mutant Ninja Turtles)|Donatello]], [[Raphael (Teenage Mutant Ninja Turtles)|Raphael]], and [[Michelangelo (Teenage Mutant Ninja Turtles)|Michelangelo]] (after a book on [[Renaissance]] artists that he found in a storm drain) and trains them in the arts of ninjutsu so that they can avenge his dead master while raising them as his own sons, as well as educating them.

In the 2003 TMNT cartoon, he possesses a significant reputation as a ninja master; in a multi-part episode, he is revealed to be a champion of the Battle Nexus, a multi-dimension-spanning contest where the greatest combatants of various dimensions come together to fight each other for the title of Battle Nexus Champion. When the Turtles learn of the Battle Nexus, they participate as well, resulting in Splinter forfeiting when called upon to fight Michelangelo, as he wishes to allow his sons the opportunity to fight where he succeeded in the past.

In the episode "Tempus Fugit", Splinter and the Turtles, who time-traveled into the future, are sent back to the present time, but the villain, Viral, blasts Splinter with a decompiler ray that scatters his bits all over the internet. While Splinter was not seen much in the "Back to the Sewers" season, the focus of those episodes is the Turtles' efforts to find Splinter's data bits by traveling all over cyberspace. Splinter is restored in the final episode and helps defeat the Cyber Shredder.

In ''[[Teenage Mutant Ninja Turtles: Mutant Mayhem]]'', much like the 2014 film, he is not Hamato Yoshi, nor is he connected to him in any way. But like the Mirage comics, he is exposed to mutagen in the sewer and not experimented on. He was a street rat that hated humans and went into the sewers to scavenge for food. But instead of food, Splinter found four baby turtles that were covered in green ooze. Splinter rescued the Turtles and got some of the ooze on him, transforming him and the Turtles. After a bad encounter with humans, Splinter decided to learn ninjutsu from online videos and [[Jackie Chan]] movies and teach it to his sons.