Dragon Ball Z the Movie: The Tree of Might, known in Japan as Dragon Ball Z: Chikyū Marugoto Chōkessen (ドラゴンボールZ 地球まるごと超決戦; lit. "Dragon Ball Z: Super Showdown for the Whole Earth") is the third Dragon Ball Z movie. It was originally released in Japan on July 7, 1990, between episodes 54 and 55 of Dragon Ball Z . It was translated into English by FUNimation Entertainment in 1998.
This movie, along with Dragon Ball Z: Dead Zone and The World's Strongest, was released in a DVD box set from FUNimation on November 12, 2006. It was later released in a double feature DVD and Blu-Ray with Dragon Ball Z: Lord Slug .
In the movie, the Z Fighters face a new threat that starts with the burning of a forest, caused by the impact of a cosmic object, in which Gohan and Krillin rescue the forest animals and a small dragon named Icarus. Although they are able to restore the forest to its normal state with the Dragon Balls, Icarus doesn't return and stays with Gohan, much to Chi-Chi's fury. Goku then shows a nearby cave to let Gohan keep the dragon with him. Later, the cosmic object that crashed and caused the forest fire earlier reveals itself to be a probe, and shortly thereafter, the Earth is visited by an unfriendly group of aliens under the leadership of a Saiyan. Upon arriving, they plant a seed which grows the Tree of Might, a plant that sucks the life of the planet on which it was planted and leaves it a desert. At King Kai's request, Goku, Krillin, Yamcha, Tien Shinhan, and Chiaotzu investigate and try to destroy the Tree, but are unsuccessful. They are then confronted by the aliens whilst their leader watches from inside the spaceship. Eventually, Krillin, Yamcha, Tien, and Chiaotzu are defeated by the aliens, with only Goku remaining as the one who can hold his own against them.
During the ensuing battle, Chiaotzu is rescued by Gohan, who had just arrived, and demonstrates his incredible fighting skills by easily taking out Rasin and Lakasei. He is then encountered by the aliens' leader Turles, a Saiyan who bears a striking resemblance to Goku. Turles gives Gohan a choice to either join him or die. Gohan refuses to join Turles, and is saved in time thanks to the arrival of Piccolo. However, Turles defeats the both of them and create an artificial moon, turning Gohan into a Great Ape and sets him on Goku, who is almost crushed to death in Gohan's hand until Icarus arrives and calms Gohan down. But when Turles attacks Icarus, Gohan is angered and turns on Turles, who fires an attack at Gohan. Before the attack can make contact, Goku manages to cut his son's tail off and restore him to normal. Cradling the little one in his arms, Goku threatens Turles. Angry and impressed at the same time, Turles sets his henchmen on Goku, who uses the Kaio-ken and makes quick work of them while Piccolo unsuccessfully fights Turles again. Goku and Turles then fight, with Goku having the upper hand, until Turles pushes his power further by eating a fruit from the Tree of Might. With his new power, Turles dominates Goku and beats him to the point that he is no longer able to fight, even with the use of the Kaio-ken x10 (x20 in the FUNimation Dub).