Dragon Ball Z Movie 04: Super Saiyajin da Son Gokuu

Gohan Son and Piccolo are peacefully playing when they sense a powerful entity approaching Earth. It soon reaches everyone's ears that this entity is in fact a small planet on a deadly collision course with Earth. Gokuu Son and Kuririn attempt to change the small planet's path with a Kamehameha, but the attack fails and the two warriors are blown away. However, after coming very close to Earth's surface, the object changes direction on its own and explodes soon after. The small planet reveals itself to be a vehicle for what seems to be a castle. A large army emerges out of the structure and declares that the planet is now in possession of Slug, king of the universe. While defending the city against the invaders' attack, Gohan loses his Dragon Ball, allowing Slug to take it. After reading Bulma's mind and stealing her Dragon Radar, Slug commands his army to collect the wish-granting relics. With the Dragon Balls in his possession, he uses them to wish his youth back. Now young, wise, and very powerful, Slug commences world domination. A giant planetoid looks like it's going to hit the earth, yet explodes just before it makes impact. The inhabitants of the planet, a group of space-pirates, land on the Earth in their little ship to terraform it and use it as a new home base. They are a bunch of horned, sun-sensitive oddities led by Lord Slug--a strangely familiar green alien. Slug learns of the Dragonballs by reading Bulma's mind; he immediately collects them and makes his wish: restore his youth. After becoming young again, the fight begins.