- Emma refuses to accompany her family on their annual vacation; Dr. Denman's return brings Zane even closer to learning the secret of his sea monster.
- The prospect of going on a family vacation to a water-side resort doesn't sit well with Emma and her excuses don't go over well with her parents or brother who are all looking forward to their annual trip. The return of marine biologist Linda Denman [episode 8] concerns Lewis and the girls but Zane sees a possible ally (or worse, a competitor) in the search for his mermaid. With Mako Island firmly in Denman's sights, the girls' secret is on the verge of being blown out of the water.
- Dr. Denman is back, and is looking for answers. Her work seems harmless at first, but she has Zane going crazy trying to find out more about the mermaids. Upon discovering a scale from one of the girls at Mako Island, Dr. Denman is obsessed with catching whatever it is that has those scales. Meanwhile, Emma is faced with a tough decision when she has to refuse to go on her annual family vacation to a beach resort, where they take part in watery games.
- Emma is forced to drop out of her family's annual holiday to a water park resort, which upsets her parents and annoys her little brother. But she and the other girls have much more to worry about, when Lewis and Cleo spot their old enemy Dr. Denman's boat anchored near Mako Island. Returning to follow up her discovery of cells that mutate on contact with water (a DNA sample from Cleo that Lewis accidentally left behind in her lab), Dr. Denman and her team of divers investigate Mako Island, and soon discover the Moon Pool - and what is worse, they also find a scale from one of the mermaids' tails. After performing some tests on the scale, Dr. Denman sees that it is identical to the cell sample she stole from Lewis, and realises that he is strongly connected to the whole thing. But she gets even closer to the girls' secret when she meets Zane, and hears his story of the mermaid he saw. At first, Dr. Denman doesn't believe a word Zane says; but when her underwater cameras set up around the entrance to the Moon Pool capture images of Emma, Rikki and Cleo, she and Zane's wealthy father team up to capture the mermaids (although they decide not to tell Zane that one of the mermaids is actually Rikki).
- Dr. Denman is back, and is looking for answers. Her work seems harmless at first, but she has Zane going crazy trying to find out more about the mermaids. Upon discovering a scale from one of the girls at Mako Island, Dr. Denman is obsessed with catching whatever it is that has those scales. Meanwhile, Emma is faced with a tough decision when she has to refuse to go on her annual family vacation to a beach resort, where they take part in watery games.
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