At Lady Sealia Foam's Mermaid School, Marnie and her classmates participate in an athletic competition, but when the crown, awarded to the winner, goes missing, Marnie swims to the rescue.
At Lady Sealia Foam's Mermaid School, Marnie and her classmates participate in an athletic competition, but when the crown, awarded to the winner, goes missing, Marnie swims to the rescue.
