Ep 4. Party Girls

Emma is excited to plan her first big party, but Cleo and Rikki aren't as enthusiastic. They're worried about Emma's parents, who are struggling with their marriage. Cleo and Rikki have to juggle Emma's party with their mermaid duties, and when they're tempted to drink some sparkling water at the party, it has a strange effect on them. Meanwhile, Lewis is trying to impress a new girl, but he's having trouble getting her attention. He enlists the help of the girls, but their attempts to strategize backfire. The group has to navigate the chaos of the party while trying to keep their secret safe. When Emma's parents make an appearance and chaos ensues, the girls are forced to use their powers to fix everything. In the end, they learn a valuable lesson about the importance of honesty and communication in relationships.