Dr. Kochin revives his mentor, Dr. Wheelo, using the dragon balls, with a plan to conquer the world. Dr. Wheelo, whose original body was destroyed in an avalanche 50 years prior, seeks a new vessel, believing the strongest fighter, Master Roshi, is the perfect candidate. To force Roshi's surrender, Dr. Kochin kidnaps Bulma, prompting Goku to launch a rescue mission.

Dragon Ball Z: The Movie - The World's Strongest
The Z-Fighters band together to thwart a genius scientist's sinister plan for global domination.