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Kim attempts to derail Don and Samantha's wedding. Lewis receives an opportunity to study in America. Cleo realises she's got to let Lewis live his own life and let him go overseas.

Pa Sertori finally announces his wedding to Samantha 'Sam' Roberts. Cleo is completely out of the mood when Kim betrays that Lewis, the best man, has, unexpectedly, won an overseas three years scholarship, which he must confirm and leave for the day after the café-beach ceremony. Kim practices more sabotage. Everything works out in the end, on Mako.—KGF Vissers

Lewis is given the chance of a lifetime with an opportunity to study overseas. But he's interrupted from telling Cleo by Sam and Don surprising everyone and announcing an early wedding ceremony. When Kim learns about Lewis' impending departure, she sees an opportunity to sabotage the event and breaks the news to Cleo. Distraught but determined, Cleo focuses her attention on organising the entire ceremony for Don and Sam on her own, outside the café. With Lewis as Best Man and Cleo as Maid of Honour, the ceremony is icy. Another stunt from Kim gives Lewis the opportunity to declare his love for Cleo and let her know his decision - he's not going. Not to be foiled by her sister, Kim plots yet another way to derail everything and this time succeeds, nearly exposing the trio as mermaids. But with Rikki, Bella, Will and Lewis' help, Cleo recovers the ceremony and transports it to Mako, to finally give Don and Sam the wedding they deserve. In the process, she realises she must let Lewis go to follow his dreams - and in a bittersweet goodbye, Lewis departs.

The day of Don and Sam's wedding arrives, and selfish Kim tries to ruin everything. Meanwhile, Lewis gets the chance to spend three years working at a scientific research centre in America, but frets about telling Cleo - until Kim tells her for him. Cleo is distraught, thinking that Lewis planned to leave without telling her, and refuses to talk to him. Don and Sam's big day is then completely ruined when Kim turns on the sprinklers (nearly making Cleo, Rikki and Bella grow tails in front of everyone). In the end, Lewis tells Cleo that he is not going to America because he loves her, and Cleo forgives him. But she decides to let him go after all, and they part promising to see each other again. The girls organise another wedding ceremony for Don and Sam on Mako Island, and Kim at last warms to Sam.