Dr. Slump: Arale-chan - episode 10 - 16 Jun, 1981

The Alien King Nikochan abducts Arale and Gatchan and is intent on destroying the Earth, but Gatchan eats the alien spaceship. While Dr. Slump builds a new spaceship, Nikochan is driven crazy by the positive reactions the inhabitants show towards aliens. The new spaceship is finished but never leaves the Earth. (Source: Wikipedia)