Scuba Scuba Doo Courage the Cowardly Dog : Season 3 Episode 9

"Scuba Scuba Doo" While on a tropical island, Courage and Muriel discover a underwater city made of coral. There, they befriend the citizens. Meanwhile, Eustace informs Ma that there are small creatures living in the coral. Ma decides that the coral there can make fine wigs, and sets off to destroy the coral city and evict the creatures of their coral for her wig factory.