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Three Australian teen girls are transformed into crime-fighting mermaids after they swim through a mysterious cave under a volcano.
Season 3, Episode 26
After the Moon Pool gets damaged, the girls resort to using their own magic to save Earth from a destructive comet.
Season 3, Episode 25
The girls uncover some unsettling news at the Mako Pool regarding a comet.
Season 3, Episode 24
Don begins working at the marine park and upstages Cleo, putting her dolphin show in jeopardy. Elsewhere, Bella and Will struggle to enjoy one another's hobbies.
Season 3, Episode 23
A misunderstanding leads Will to be honest with Bella. Elsewhere, Sophie pressures Zane to change the café's name.
Season 3, Episode 22
The full moon rises early, forcing the girls to be careful about avoiding exposure. The girls then head to the Moon Pool and receive a message about Mako Island.
Season 3, Episode 21
The girls try to retrieve a Mako crystal from Zane, who snatched it to attract Rikki's attention.
Season 3, Episode 20
Sophie is put in charge of the café, so she tries to fire Bella after Bella's new sneezing allergy accidentally activates her powers.
Season 3, Episode 19
Will cuts ties with Sophie and walks away from free diving. Meanwhile, Rikki spots Sophie kissing Zane.
Season 3, Episode 18
Rikki worries about Ryan touring Mako Island, and she goes to great lengths to stop him.
Season 3, Episode 17
Cleo meets a geophysicist named Ryan and discusses the Mako rock with him, much to Rikki's chagrin.
Season 3, Episode 16
Rikki confronts the bizarre force in the Moon Pool, and the encounter changes her.
Season 3, Episode 15
Sophie steals Bella's fund-raising idea. Elsewhere, Samantha moves into the Sertori home, where Kim struggles to accept her presence.
Season 3, Episode 14
Will exerts himself while trying to impress Zane with his diving abilities. Elsewhere, the girls find an unusual crystal in the rock from the Moon Pool.
Season 3, Episode 13
Kim tries to halt Don's marriage to Samantha. Meanwhile, Lewis gets a chance to study abroad, and Cleo knows she can't stand in his way.
Season 3, Episode 12
A group of felons take Rikki hostage on a boat, and Bella and Cleo reveal a major secret to Will so that he will help save her.
Season 3, Episode 11
Bella assists Will with his diving techniques; Rikki and Cleo host a children's party at the café.
Season 3, Episode 10
Bella's advised to keep her distance from Will as he gets closer to uncovering the mermaid secret.
Season 3, Episode 9
Despite Lewis' warnings, Cleo plays with the magic water. Meanwhile, Rikki accidentally endangers Cleo's fish.
Season 3, Episode 8
A water tentacle captures Bella, and the girls set out to save her while Lewis distracts Will.
Season 3, Episode 7
Family complications lead Don to break up with Samantha, but Cleo suggests he reconsider this; Bella and Will's sister apply for the same job at the café.
Season 3, Episode 6
Bella makes a move with Will, and then backs off when it appears he's not single; Lewis' science teacher becomes interested in the Moon Pool water.
Season 3, Episode 5
Rikki uncovers a con Zane is planning; Cleo and Lewis learn something new about the Moon Pool water.
Season 3, Episode 4
Cleo prioritizes her sister's love life over her own; Cleo's dad starts a new romance.
Season 3, Episode 3
Cleo wants to work with dolphins; Rikki bars Nate's band from the café while she sorts things out with Bella.
Season 3, Episode 2
Bella tries to prevent Will from discovering the Moon Pool; a change occurs in the Moon Pool.
Season 3, Episode 1
Cleo and Rikki enter their final year of high school in the wake of Emma's departure, and they befriend Bella and Will.
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