Ultraman Kids 3000: S1 E11 - Little Rascals In The Submarine City Ultraman Kids 3000

Everyone is starting to feel the lack of exercise from spaceship life, so they all go down to play on Planet Tepeta, which is mostly covered by ocean. Unfortunately, in order to conserve valuable air, Planet Tepeta is completely managed by computers, and children have been banned by law from running around and playing.