A fun-filled day at the park nearly turns to tragedy, when a runaway baby carriage speeds off alone the hilly sidewalks and open lawn with nobody able to stop it! In an effort to save the baby Jacob, Kim, Billy, and Tommy give chase, and encounter three teen pals from Stone Canyon high school (Rocky, Aisha, and Adam), trying to do the same. Their combined efforts succeed, and a new friendship is formed between the two groups. The three new teens take part in, and win, the Ninja Championship tournament at the Youth Center, beating out a trio of bullies. Lord Zedd, having been eyeing the bullies to become his own evil warriors, now turns his attention to Rocky, Adam, and Aisha! Meanwhile, Bulk & Skull become unwitting babysitters for Jacob!