Voir Adventures of Sonic the Hedgehog, Season 1, Vol. 2 - Episode 25

When an undersea world is threatened by Captain Memo and his lobster sub, Sonic spreads a rumor that Memo plans to attack Robotnik next. When Robotnik hears of it, he launches an attack on Memo with a Shark-shaped sub, but Sonic's plan backfires when Robotnik decides that he will conquer the undersea world himself. With the help of a friendly school of porpoises, and the Mer-People of the undersea world, Sonic sends Robotnik and Memo floundering away.