<P> In the 2012 cartoon, Casey (voiced by Josh Peck) is the teenage son of a former NHL player at April's school who April was assigned to tutor for a school assignment, and eventually became something more than friends, much to Donatello's jealousy . This unfortunately almost put April and Casey in jeopardy when the Turtles saved both humans from Mutagen Man and a squad of Foot - Bots led by Karai and Chrome Dome, so after April met with the Turtles again to owe them her gratitude for their mistake that caused her father's mutation, Casey took up the role of getting rid of all the criminals and troublesome mutants inhabiting the city as an amateur vigilante . He encountered Raphael during a fight with the Purple Dragons and later followed him to the Turtle Lair, where he is introduced by April to the other three Turtles and Splinter . However, he unknowingly led a pair of Foot - Bots to the lair as well, so he and Raphael had no other choice but to set aside their differences and stop them before the lair's location is exposed to the Foot Clan . </P> <P> Hamato Yoshi is a ninjutsu master whose history is always intertwined with Splinter's . </P> <P> As Splinter's owner, Yoshi was the greatest shadow warrior of the Foot Clan in Japan, and trained Splinter in the art of ninjutsu by allowing the rat to copy his katas from inside his cage . Fortunately, Yoshi was put in a fierce competition with rival clan member Oroku Nagi and the two fought for everything, including the love of a young woman named Tang Shen . This came to a tipping point when Nagi visited Shen at home and beat her out of jealousy and anger when she favored Yoshi . Enraged, Yoshi took it upon himself to kill his rival, but this action shamed him in the eyes of the clan and forced him to escape to America with Shen and Splinter . Moving to New York City, the family was later pursued by Nagi's younger brother Saki, who was promoted as the Foot Clan's deadliest leader and the head of its American branch . Taking on the persona of "the Shredder", Saki followed the two lovers home and killed them both in vengeance of Nagi . However, Splinter escaped to the sewers and was mutated along with the Turtles . He then proceeded to teach ninjutsu to the Turtles as he himself had learned it from Yoshi, in order to have them avenge his owner's death . </P> <P> In the 1987 cartoon, Yoshi (voiced by Peter Reneday) was a Foot Clan shidoshi trained under the wise master Pasang back in Japan, but exiled himself to New York City after being framed by Oroku Saki for the attempted murder of a visiting sensei . There, Yoshi was forced to live in the sewers in shame, befriending the rats and adopting four baby red - eared slider turtles that were accidentally dropped by a boy into a sewer grate . Fifteen years later, when Saki moved into the city under his Shredder persona and discovered Yoshi there as well, Shredder dumped mutagen in the sewers . However, this instead mutated Yoshi into Splinter, who then started training the also mutated Turtles in ninjutsu to stop Shredder's rise to power over the city's criminal underworld . </P>

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