The evil Dr. Kochin uses the dragon balls to resurrect his mentor, Dr. Wheelo, in an effort to take over the world. Dr. Wheelo, his body having been destroyed by the avalanche that killed him fifty years before, desires the body of the strongest fighter in the world as his new vessel. Believing Roshi to be the world's strongest warrior, Dr. Kochin abducts Bulma and forces Roshi to surrender himself to save her. When Goku hears of their abduction, he goes to their rescue.
Dragon Ball Z: The World's Strongest is a 1990 Japanese animated science fiction martial arts film and the second feature film in the Dragon Ball Z franchise. It was originally released in Japan on March 10 between episodes 39 and 40 of DBZ, at the "Toei Manga Matsuri" film festival along with the second Akuma-kun film and the 1990 film version of Sally the Witch. It was preceded by Dragon Ball Z: Dead Zone and followed by Dragon Ball Z: The Tree of Might.
