When he accidentally takes possession of a top-secret invisibility potion while en route to his wedding, government bureaucrat Sam Cooper finds himself engulfed in a madcap free-for-all as Russians and other bad guys try to get the substance. To elude the Reds, his own State Department bosses and his livid fiancée, Cooper takes the vanishing juice himself—which only makes matters worse.

Daniel moves to Los Angeles with his mother, Lucille, and soon strikes up a relationship with Ali. He quickly finds himself the target of bullying by a group of high school students, 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.

After discovering that his father is at death's door, Mr. Miyagi sets out to Japan, to see him with Daniel. Upon arriving, Miyagi must confront an old rival. Meanwhile, Daniel encounters a new love, and some new enemies.

Small time crooksters Nick and Charlie have an elaborate plan to rob an exclusive jewelers store. Using a variety of disguises and posing as rich old men and women they begin the set-up, but then Nick falls for the owner of a neighboring antique store and things get a little complicated.

When East German Eric Brogar wins a gold medal in the pentathlon, he escapes to freedom in the west with the help of a beautiful American athlete. But his demanding coach, Heinrich Mueller vows revenge and Eric's best friend and his father pay the ultimate price for his freedom when they are killed by the Secret Police. In Los Angeles, Eric starts to train for the gold again. But when Mueller comes to America, Eric must win the most deadly game of all… the fight for his life.