Teenage Mutant Ninja Turtles (1987): Season 7, Episode 23

7 - 23: Atlantis Awakes

The Turtles discover an Atlantean city, not in ancient Greece, but in modern times. After meeting a merman who, in reality is the true King of Atlantis, the Turtles must defeat Shredder & dethrone Bebop, who been set up as a puppet king.