Dragon Ball Z: The World's Strongest
ドラゴンボールZ この世で一番強いヤツ (original)
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.
Starring Masako Nozawa, Toshio Furukawa, Mayumi Tanaka, Hiromi Tsuru, Kōhei Miyauchi, Mayumi Shou, Naoki Tatsuta, Kenji Utsumi, Kōji Yada, Yukimasa Kishino
It's a action & adventure and animation movie, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.