Mogura no Adventure

A mole named Kuro-chan falls asleep under the sun and embarks on a space voyage in his dreams. There, he meets some strange-looking aliens living on a different planet. Note: This is the oldest known surviving Japanese television animated work. Until its discovery, Atarashii Douga: Mittsu no Hanashi, a 1960 black-and-white work produced by NHK, held that distinction.