In The Missing Crown, Ester and Polvina, who were riding on Panjo (a seahorse), accidentally knocked the Turtle Crown off a turtle he was riding. The crown dropped into a field of seaweed, but was caught by some Drylander hooks.
The Turtle King then visited the school, where he requested that Ester and Polvina get the crown back. They eventually found the crown on a Drylander boat and subsequently, returned it to the Turtle King.
Later, the Turtle King dropped the Turtle Crown off at the Salacian Museum for display, which was his intention.
The Turtle King is voiced in English by Steve Rodgers.