Saki (Tadanobu Asano) had sworn vengeance against Yoshi, the man who had killed his sibling. His anger pushed him to become a premiere ninja in the Foot, and as a reward for his hard work and diligence, the Clan sent him to New York City to lead the Big Apple's branch of ninjas. Saki recognized this as his opportunity to reap his revenge against Hamato Yoshi and slay him. Anguished over the death of his Master, Splinter (Ken Watanabe) fled to the alleys and lived off of garbage scraps. Until the day when a truck drove by, and a strange canister flew out of its hold. The container struck a young man in the head, bounced off of the pavement and smashed into a boy's aquarium filled with turtles. The shattered glass, canister and turtles all fell into an open manhole cover, dropping into the murky sewer below. The metal container held some strange chemical, and when it hit the floor of the sewer it broke, bathing the turtles in its glowing ooze. Splinter, curious, went to see what had become of the turtles. He collected them into a coffee can and cleaned the goo off of them as best he could. The next day the wise rat found that he and the turtles were mutating... becoming more human-like with each passing day! Eventually the turtles spoke, and Splinter began to set his own plan for vengeance into motion. He began training the turtles in the art of ninjutsu that he had learned from Hamato Yoshi.
