Title: H2O: Mermaid Adventures (TV Show, 2015)
Cast: Sonja Ball, Holly Gauthier-Frankel, Thor Bishopric, Angela Galuppo
Country: Germany, Australia, France, China
Rating: TV-Y7
Duration: 2 Seasons
Genres: Kids' TV
Three high school friends who turn into mermaids whenever they touch water have undersea adventures while keeping their new life a secret.