4.00PM FRIDAY NOVEMBER 9 ON TEN

Cleo has been getting into some trouble with her boss Mrs Geddes at work and when Ronnie the dolphin splashes her, Cleo laughs and is fired.

At the same time, Lewis finds himself in desperate need of a job after his laptop dies and, unbeknownst to him, he is offered Cleo’s old job.

Upset, the girls use their mermaid powers to make the job unbearable for Lewis. But the prank goes terribly wrong, leading to Ronnie accidentally escaping the marine park. Lewis has to take the fall to protect the girls’ secret.

Emma, Rikki and Cleo must figure out a way to clear Lewis’s name without risking exposure.