Charlotte has "mastered" her powers and tells Lewis she's better than the girls and is therefore a "super mermaid". With Lewis's birthday coming, Charlotte is determined to plan the "perfect" party for him and refuses to accept the girls' ideas. Rikki gets fed up and leaves to spend time with Zane, excluding herself from the group. Charlotte invites all her friends rather than Lewis's and chooses Lewis's least favorite music. To keep Cleo and Emma from "ruining" the party, Charlotte secretly traps them inside the pool room, uses wind to shut the door, freezes the knob, and turns them into mermaids.
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