Lewis is being troubled by recurring nightmares of Cleo being exposed as a mermaid, and it is clear that he still has feelings for her. Meanwhile, Elliot surprises everyone by asking Kim out on a date, and Lewis and Cleo act as chaperones when they go to the marine park. But is Lewis' nightmare coming true when Cleo falls in to the water, and someone spots her? Elsewhere, Emma grows suspicious when she discovers that Rikki has been having secret meetings with Ash... but it turns out the two of them were only planning to give her an award.