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. Phoebe Tonkin, Cariba Heine, Angus McLaren, Burgess Abernethy, Claire Holt, Indiana Evans, Luke Mitchell Added on HBO 2022-06-06. Added on Netflix 2022-03-30. Added on Amazon Prime 2023-07-19. Youtube Trailer