Adapt from The Mirage Comic, the four Turtles were exposed to the Mutagen when after a traffic accident with their young owner as a bystander. The mutagen mutated them into a more humanoid form and more developed intellect. Splinter, a rat once owned by Ninjutsu master Hamato Yoshi, was also exposed. Splinter was fantastically smart and learned Ninjutsu by mimicking his master. Hamato Yoshi moved from Japan to New York in order to escape death after killing Oroku Nagi, another member of the Foot Clan, over the bitter love triangle between him and Tang Shen. However, Yoshi and Shen were found and killed by Nagi's younger brother Oroku Saki. Saki was the leader of the New York branch of the Foot Clan and had taken the identity of The Shredder. Yoshi's death had left Splinter homeless. Splinter happens to see the Turtles after the accident and adopts them. Within days, both Splinter and the Turtles grow to human size and develop speech. Splinter trained them in Ninjutsu, so they could avenge the murder of Hamato Yoshi and his wife. Splinter choose their names from a book about Renaissance artists: Donatello, Leonardo, Michelangelo, and Raphael. The Turtles challenge Shredder and the Foot Clan on a roof top and defeat them. Shredder falls off the roof, with a grenade that blows up.
