Teenagers always feel different, but these three teenagers are really different, they are mermaids. Trying to keep her special powers a secret is difficult for a fearless teenager named Brianna Howards and her best human friends, Penny Park and Layla Baylor. When they're not at school, they use their magical powers to save sea turtles and rescue those in need, to defeat the evil pirate Zello and the witch RavenRafaella. Local jock Bully Hank and his snobbish girlfriend Mallory want Brianna and her friends when they become mermaids. But the girls head east to keep their adventures hidden, except for their human friends Caleb, Lucy, Lion and Jonatahan, who help them.
