Tree of Might

Gohan, Krillin, Oolong, and Bulma are having a camp-out. That night, they wake up and are shocked to find the entire forest up in flames. Gohan and Krillin use their ki blasts to put out the flames. During that time, Gohan rescues a baby dragon. The fire is put out and Gohan and the dragon become friends. He names it Icharus (spelling?). The forest is completely destroyed now so they summon the Eternal Dragon and wish that it would be restored to what is was like before the fire. Meanwhile, a group of space pirates have landed on Earth. One of them drops a seed down a crevasse. The seed begins to grow at alarming rates. It becomes the Tree of Might! The tree continues to grow and takes over the entire forest. It moves to the city where the roots are destroying houses, buildings, everything!

Goku, Gohan, Krillin, Tien, Chiaotzu, and Yamcha all team up to defeat the space pirates. They all put up a good fight, but all eventually go down hard. Gohan rescues Chiaotzu from one space pirate and from inside the spaceship, an evil Saiyan named Turles notices Gohan's Saiyan strength. Gohan defeats the minion, but then gets captured by Turles who tortures him. Turles looks just like Goku, and Gohan is confused at first. Piccolo comes to the rescue, but gets blown away by a blast. Turles notices Gohan's tail and creates a bright ball of artificial moonlight. He spins Gohan around like a rag doll and makes him look at the moon. At the last second, Goku comes running, but Gohan has already transformed into an Oozaru(a giant ape like King Kong)! He swats Goku around and beats him up. Turles is enjoying the father/son battle.

Fortunately, Oozaru Gohan sees Icharus and his soft spot is revealed. He becomes tame and Turles is mad. He blasts Icharus, which really ticks off Oozaru Gohan. He starts chasing Turles, who shoots an energy ring at him. Goku fires an energy disk and cuts off Gohan's tail, changing him back into a boy. Gohan falls into his dad's arms. Goku decides to get revenge on Turles for messing with his son. The other space pirates arrive but Goku beats them all at once. The first round in the "Goku vs. Turles" battle begins and Goku proves he has more strength than Turles thought possible. They stop for a minute, and Turles finally explains his task. He planted the seed for the Tree of Might because the tree contains some magical fruit. Once it finishes growing, the fruit will ripen. When Turles eats it, it will give him fantastic powers, and he'll be unstoppable. The only catch is that the Tree of Might will suck up Earth's nutrients, leaving the entire planet withered up, dry, and transformed into a barron desert.

The fight continues and Goku seems to be doing very well, until Turles takes a big bite out of a piece of fruit on the Tree of Might. His muscles bulge and he beats up Goku with the greatest of ease. The badly-beaten Z Fighters return for more but, as you can imagine, they get beaten by Turles. Goku gathers energy for the Spirit Bomb, but Turles deflects it easily. Goku is knocked out and Turles is about to leave, I think. Until Goku gets back up weakly and gathers energy from the Tree. He starts talking to Turles, then suddenly, he fires another Spirit Bomb. This time, the evil Saiyan can't hold it back and is destroyed by it. The movie ends with everyone having another campout.