Cleo uses her mermaid powers to avoid a sprinkler and inadvertently splashes Charlotte, the new girl at school. Lewis and Charlotte meet and it’s clear she likes him straight away. With the girls’ mermaid powers turned up to max, Lewis tries his best to help but his attempts only cause Cleo to feel crowded by him. Frustrated, Cleo finally has enough of Lewis’ smothering and reluctantly dumps him. Lewis is devastated but he meets Charlotte once again and they bond. Meanwhile, Emma uses her new powers to help Elliott win at soccer.