Revealed!! Earth's Secret (バレタ!!地球のひみつ Bareta!! chikyuu nohimitsu) is the 233rd episode of Dr. Slump Arale-chan.
Synopsis[]
While Arale and her friends are playing, they find a fossil house in the hole. When Senbei starts research on the fossil house, he finds a letter which is written in ancient characters. Turbo reads the words with his magical powers, and he finds out it is writing about an old secret of Earth...