In the episode, "Tempus Fugit", Splinter and the Turtles, who time-traveled into the future, were sent back to the present time, but the villain, Viral, blasts Splinter with a decompiler ray that scatters his bits all over the internet. 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 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. 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. The canister mutates both Splinter and the turtles, in which it also enhanced the former's already sophisticated intellect. Due to a traffic accident, four baby turtles and a canister of mutagenic ooze are sent down into the sewer. Without a home, Splinter is forced to run away and live in New York City's sewers. In contrast, in the 2003 TMNT cartoon series, it was Hun's face which Splinter clawed. It is suggested that this mutilation is the reason Saki took the Shredder disguise to hide the scars.
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Additionally, in the 1990 film, Splinter escapes from his cage during the murder, and attacks Saki, clawing at his face.
TMNT DEATH SERIES
However, in the 1990 film and 2003 TV series Nagi is removed entirely. Yoshi becomes embroiled in a dispute with a fellow ninja by the name of Oroku Nagi and is eventually murdered by Nagi's brother, Oroku Saki, who is seeking revenge for his brother's death. Intelligent for his species, Splinter is able to learn ninjutsu art by mimicking his master's movements while he practiced.
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In both the original comics and the live-action movies, Splinter is the pet rat of a ninja named Hamato Yoshi in Japan. Mirage Comics, original films, 2003 cartoon 1 Mirage Comics, original films, 2003 cartoon.