H2O: Just Add Water - Season 1 - Eps 5: Something Fishy
Cleo's sister Kim finds her diary and thinks that Cleo and her friends are 'evil mermaids' and she plans to tell everyone. Meanwhile, Lewis goes to Mako Island to find out more about what happened to the girls.
About H2O: Just Add Water

Title: H2O: Just Add Water
First Air Date: 2006-07-07
Last Air Date: 2010-04-16
Status: Ended
Rating: 7.8/10 (from 650 votes)
Language: EN
Seasons: 3
Total Episodes: 78
Network: Network Ten
Genres: Drama, Family, Sci-Fi & Fantasy
Production Companies: Pacific Film and Television Commission, Jonathan M. Shiff Productions, Network Ten, ZDF
Synopsis
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.
Cast

Phoebe Tonkin
Cleo Sertori

Cariba Heine
Rikki Chadwick

Indiana Evans
Isabel "Bella" Hartley

Luke Mitchell
Will Benjamin

Burgess Abernethy
Zane Bennett