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. In both the original comics and the 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, Oroku Saki, as revenge for his brother's death. However, in the 1990 film and 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 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, Donatello, Raphael, and 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.(via Wikipedia)
