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.
Quest roles:
Cleo Massey(Kim Sertori), Trent Sullivan(Elliot Gilbert), Annabelle Stephenson(Miriam Kent), Alice Hunter(Tiffany), Caroline Kennison(Lisa Gilbert), Alan David Lee(Don Sertori), Andrea Moore(Mrs. Geddes), Jenna Hudson(Libby McIntyre), Jared Robinsen(Neil Gilbert)