Dragon Ball Z: The Tree of Might (1990)

Dragon Ball Z: The Tree of Might, also known by its Japanese title Dragon Ball Z: The Decisive Battle for the Entire Earth or Toei's own English title Super Battle in the World, is the third Dragon Ball Z feature film. It was originally released in Japan on July 7, 1990, between episodes 54 and 55 of DBZ, at the "Toei Anime Fair" film festival, where it was shown as part of an Akira Toriyama-themed triple feature titled Toriyama Akira: The World (the other two films were anime versions of his one-shot stories Kennosuke-sama and Pink).

More at Wikipedia.