Sofia the First: The Floating Palace (2013)

Embark on an underwater adventure in “Mermaid Friends”! When Sofia befriends the mermaid Una, she mysteriously transforms into a mermaid herself. As they frolic in the sea, Una is captured by an evil sea monster. Sofia seeks help from Una’s friends, but they distrust humans and refuse to believe her. Just when all hope seems lost, Ariel appears, wielding the power of a magical pendant. She advises them that “helping each other is important.” Can Sofia save Una?