Dragon Ball Z: Lord Slug

At "Capsule Corporation," they discover a gigantic asteroid is about to crash into Earth. Everyone tries to hide to protect themselves from the asteroid, but Goku and Krillin try to stop it. At first, it seems they fail and lose consciousness. Just before the asteroid hits Earth, it explodes into thousands of pieces from the powerful attack by Goku and Krillin. From the asteroid emerges a spacecraft, and from it, hordes of soldiers who inform the curious humans who had approached that the planet now belongs to Lord Slug (a Namekian who was expelled from his home planet for his evil). His goal is to gather the Dragon Balls to regain his youth and turn the planet into a suitable place for the demon army that accompanies him.