In 3 Ninjas Kick Back, the three young ninjas, Rocky, Colt, and Tum Tum, are back for another adventure. This time, they must travel to Japan to return a ceremonial dagger to its rightful owner, their grandfather's old friend, Mori Tanaka.
Upon arriving in Japan, the boys discover that Mori Tanaka's dojo is in danger of being taken over by a rival martial arts school. To save the dojo, the ninjas must compete in a karate tournament and prove their skills.
As they face off against tough opponents and navigate the challenges of a foreign country, the three ninjas must rely on their training and teamwork to succeed. Will they be able to save the dojo and return home victorious?