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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.
Phoebe Tonkin
Cleo Sertori
Cariba Heine
Rikki Chadwick
Indiana Evans
Isabel "Bella" Hartley
Luke Mitchell
Will Benjamin
Burgess Abernethy
Zane Bennett
