H2O: Just Add Water (2006)

Name: H2O: Just Add Water
Genre: Drama, Family, Sci-Fi & Fantasy
Cast: Phoebe Tonkin, Cariba Heine, Angus McLaren, Burgess Abernethy, Claire Holt

H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.