New Jersey teen Daniel LaRusso moves to Los Angeles with his mother, and soon strikes up a relationship with Ali. He quickly finds himself the target of bullying by a group of thugs, led by Ali's ex-boyfriend Johnny, who study karate at the Cobra Kai dojo under ruthless sensei John Kreese. Fortunately, Daniel befriends Mr. Miyagi, an unassuming repairman who just happens to be a martial arts master himself. Miyagi takes Daniel under his wing, training him in a more compassionate form of karate for self-defense and, later, preparing him to compete against the brutal Cobra Kai.

A treasure map found by three young boys allows them reason to get their kicks in more ways than one.

In the Arizona desert during an attack on a military convoy, mercenaries keep young Kasuko, from the Japanese royal family, as a hostage. While the Yakuza tries to gather the money asked, her family asks for the help of a powerful ninja warrior to free her.