2006 Metamorphosis S1, Ep1 Jul. 7, 2006 Metamorphosis Skylarking on the waterfront, three ordinary teenage girls stumble upon a strange pool on the mysterious Mako Island. When the full moon strikes its waters, the girls are transformed into Mermaids with magical powers over water.
Pool Party S1, Ep2 Jul. 14, 2006 Pool Party As the girls try to live with the consequences of becoming mermaids, the question arises as to who they can trust with their secret.
Catch of the Day S1, Ep3 Jul. 21, 2006 Catch of the Day For Cleo, there is only one thing worse than becoming a Mermaid: the possibility her father is illegally fishing.
Party Girls S1, Ep4 Jul. 28, 2006 Party Girls Cleo convinces Emma to go ahead with her traditional slumber party, with some unexpected results.
Something Fishy S1, Ep5 Aug. 4, 2006 Something Fishy After discovering Cleo's Mermaid diary, Cleo's little sister is determined to save the Gold Coast from the 'evil Mermaids'.
Young Love S1, Ep6 Aug. 11, 2006 Young Love When Rikki drags Elliot from the surf Emma is worried about exposure, but Rikki is more worried about the crush he's developed.
Moon Spell S1, Ep7 Aug. 18, 2006 Moon Spell Cleo receives a mysterious warning: do not stare at the full moon, not even its reflection. Emma is more concerned about her father's surprise birthday party.
The Denman Affair S1, Ep8 Aug. 25, 2006 The Denman Affair Lewis gets a job as lab assistant to the beautiful Dr Denman in an effort to find more answers for the girls, but they're not convinced he can keep their secret.
Dangerous Waters S1, Ep9 Sep. 1, 2006 Dangerous Waters When Cleo's pet fish passes away, Rikki tries to cheer her up.
The Camera Never Lies S1, Ep10 Sep. 8, 2006 The Camera Never Lies Not convinced an interview with Emma's mum will win the short film competition, Rikki decides to get some award-winning shark footage. Zane recruits Lewis to re-enact a record windsurfing run.
Sink or Swim S1, Ep11 Sep. 15, 2006 Sink or Swim Byron asks Emma to coach him for the school swimming carnival. Rikki vents her frustration at Lewis's apparent disinterest in the girls as anything other than specimens.
The Siren Effect S1, Ep12 Sep. 22, 2006 The Siren Effect The strange old woman warns the girls about the dangers of the full moon but Cleo falls under its spell this time; she turns into a Siren and develops a singing voice that brings half the boys in the neighborhood to her doorstep.
Shipwrecked S1, Ep13 Sep. 29, 2006 Shipwrecked Emma stumbles upon the mysterious Elder who knows more about what it means to be a Mermaid than the girls themselves.
Surprise! S1, Ep14 Oct. 6, 2006 Surprise! Why is Cleo so desperate to avoid celebrating her 16th birthday? Zane recruits Lewis in his hunt for the 'sea monster'.
The Big Chill S1, Ep15 Oct. 13, 2006 The Big Chill When Emma is left in charge of the Juicenet café, Mirrium is determined to make things go wrong. When she turns of the cooling system in the cold room, Emma tries to fix it by freezing everything in the room, including Mirrium hiding inside!
Lovesick S1, Ep16 Oct. 20, 2006 Lovesick
Under the Weather S1, Ep17 Oct. 27, 2006 Under the Weather Rather than risk exposure by getting wet in a rainstorm, Emma, Cleo and Rikki decide to play sick to avoid having to go to school. However, they overdo it and when the Dr is called to check in on the girls, she becomes alarmed and alerts the CDC that there may be a dangerous contagion.
Bad Moon Rising S1, Ep18 Nov. 3, 2006 Bad Moon Rising Another full moon is happening, the girls and Lewis try there best to make sure no moon light can get in, and they succeed, until Lewis leaves, Cleo and Emma block the moon light, but Rikki see's it from a reflection in her water. Rikki loses control of her power and flee's to Make island after being scared of hurting Cleo and Rikki. Meanwhile, Zane, being haunted by the tail he saw when we he almost drowned, does some research which leads him to Mako. He finds Rikki surrounded by fire. Feeling scared and lonely, they kiss but Rikki ends up hurting Zane, and she …
Hurricane Angela S1, Ep19 Nov. 10, 2006 Hurricane Angela Angela, who is Cleo and Kim's cousin, comes to town for a visit. She acts very grown up and sweet but when Cleo takes her to the amusement park with her sister, she disappears. Cleo and Kim search for her but all Cleo finds is a rather large bird in the bathtub at home. When Cleo tries to return the bird, she is caught and it is assumed she was stealing the bird instead.
Hook, Line and Sinker S1, Ep20 Nov. 17, 2006 Hook, Line and Sinker Lewis' excitement about testing his new lure in the annual fishing derby is quelled by Cleo's refusal to renew their traditional partnership for fear of getting wet. When Lewis struggles, Cleo decides to use her mermaid powers help Lewis land the “big one” but when he is accussed of cheating, he is kicked out of the competition by Cleo's father and forbidden from seeing her again. Rikki and Zane encounter one another at a business seminar and get trapped on a balcony. The time alone together allows them to get to know one another better, perhaps a little too well when…
Red Herring S1, Ep21 Nov. 24, 2006 Red Herring
Fish Out of Water S1, Ep22 Dec. 1, 2006 Fish Out of Water Rikki and Zane begin secretly dating but Cleo and Emma catch them together at the movies. Cleo and Emma demand that she stop seeing Zane, forcing her to choose between him and them. Rikki refuses saying that true friends would never make her choose.
In Too Deep S1, Ep23 Dec. 8, 2006 In Too Deep
Love Potion #9 S1, Ep24 Dec. 15, 2006 Love Potion #9 Lewis thinks he has invented a potion to make the girls waterproof for their big dance. However, his concoction has an undesirable side effect, turning the girls bright red right in the middle of the dance.
Dr. Danger S1, Ep25 Dec. 22, 2006 Dr. Danger
A Twist in the Tail S1, Ep26 Dec. 29, 2006 A Twist in the Tail
2007 Control S2, Ep2 Sep. 28, 2007 Control Another full moon rolls around and this time all 3 girls are drawn to the moon pool where their powers are increased and they cause trouble for Lewis. The following day they realize they need help controlling these new powers.
Fire and Ice S2, Ep4 Oct. 5, 2007 Fire and Ice After Rikki calls Emma responsible, Emma decides to do the opposite and throw a party while her parents are away. Nate gets dating advice from Lewis and uses it on Cleo. When Lewis discovers this at Emma's party, a fight breaks out and Emma's mom's new glass dolphin figurine gets broken.
Hocus Pocus S2, Ep5 Oct. 26, 2007 Hocus Pocus Lewis acquired, via Inernet, a 'mermaids mythology' book, which he claims to be a magic manual. The girls are incredulous, but Clio decides to try the potion to enable them to grant wishes. It seems mute, but works when invoked in mermaid shape. But bad use makes it dangerous and physically unstoppable. That proves more then inconvenient now Winfred needs to save the café, for which she proposed a TV commercial, which he directs and she stars in.
Pressure Cooker S2, Ep6 Nov. 2, 2007 Pressure Cooker Cleo catches her father with a woman and makes the mistaken assumption that she is his girlfriend. Things get worse when she discovers that the woman is Charlotte's mother. The girls sabotage dinner when her father invites her and Charlotte over for dinner. Cleo's jealously grows as she watches Charlotte and Lewis together.
In Hot Water S2, Ep7 Nov. 9, 2007 In Hot Water Cleo is fired from the marine park and Lewis is hired not realizing that he is taking Cleo's job. Rikki and Emma swim to the park and take revenge on him while he is trying to serve ice cream. He discovers them and they swim away, accidentally leaving the dolphin's door open. Ronnie (the dolphin) escapes and the girls have to find him and return him to the marine park before Lewis gets in trouble from being accused of the one who did it.
Wrong Side of the Tracks S2, Ep8 Nov. 16, 2007 Wrong Side of the Tracks Zane is accused of being the one who steals Rikki's dad's motorcycle emblem when he attempts to return it. Rikki is embarrassed that she lives in a trailer park and lies to Zane about living elsewhere. Zane tries to patch things up with Rikki's dad when he discovers who he is and fixes his motorcycle.
Riding for a Fall S2, Ep9 Nov. 23, 2007 Riding for a Fall Emma takes her brother for horseback riding lessons and immediately takes a disliking to his instructor, Ash. She doesn't listen to his instructions and accidentally allows his horse to eat some weeds that make him sick. A misunderstanding has Lewis with 2 dates to an award banquet.
Missed the Boat S2, Ep10 Nov. 30, 2007 Missed the Boat Cleo begins to fail Biology because she hasn't been studying with Lewis. Charlotte volunteers to tutor her so that Lewis won't have to and gives her a lot of work to do, keeping her busy all weekend. Cleo gets wet while spying on Lewis and Charlotte so Lewis kisses Charlotte to keep her from seeing Cleo.
In Over Our Heads S2, Ep11 Dec. 7, 2007 In Over Our Heads Rikki's father stresses over bills and thinks they may have to move. Zane shows Rikki information about a sunken treasure and she manipulates the situation to get Emma and Cleo to help with the search. When they discover she deceived them, they get upset and leave Rikki and Zane alone to search. Rikki finds it, but is knocked unconscious when the crate hits her as she is trying to get it up to Zane.
Monster S2, Ep12 Dec. 14, 2007 Monster Both Cleo's fish and Emma hurt themselves on a piece of coral. They begin acting strangely and Rikki and Cleo have to figure out why. Lewis brings the fish and piece of coral to a scientist who comes up with a cure for the fish. Lewis brings the rest of the antidote back to Emma to cure her too.
Moonwalker S2, Ep13 Dec. 21, 2007 Moonwalker Cleo's father decides to take his daughters camping on Mako island during a Full Moon. Cleo invites Rikki and Emma along and Lewis invites himself. Charlotte discovers the plans and decides to tag along as well. Kim wakes Cleo to tell her that Charlotte and Lewis are gone and she becomes affected by the moon and goes to the moon pool. When Rikki and Emma find out that Cleo is gone, they too become affected and head to the moon pool. Charlotte attempts to find them and discovers the moon pool herself just as the moon passes overhead. She almost touches the water while …
Cleo vs. Charlotte S2, Ep14 Dec. 28, 2007 Cleo vs. Charlotte Emma gets mad when Ash gets the Manager job that she thought she was going to get at the juice bar. She fights him about every change he makes until he fires her for something she didn't do. Lewis tells Charlotte that Cleo is his friend and he plans to spend time with her too.
Double Trouble S2, Ep16 Oct. 10, 2007 Double Trouble Zane returns and tries to win Rikki's attention. He discovers she is still a mermaid when she gets splashed on the dock and has to run and dive into the water. Cleo starts getting jealous of the time Lewis is spending with Charlotte.
2008 The One That Got Away S2, Ep3 Jul. 9, 2008 The One That Got Away
Irresistable S2, Ep15 Jan. 4, 2008 Irresistable Zane finds a bottle containing a scent that is rumored to drive mermaids crazy. When they find the smell appalling, they leave it on a table where Nate finds it and rubs it all over himself. All three girls become affected by the smell and stick close to Nate's side while Lewis and Zane have to figure out how to get it away from him and break the spell.
Visions S2, Ep16 Jan. 11, 2008 Visions
Moonstruck S2, Ep17 Jan. 18, 2008 Moonstruck The girls prepare for the full moon again and insist they don't need Lewis' help. Rikki and Cleo suggest Ash to be more bold with Emma. Following their advice, Ash decides to do a surprise visit which could uncover their secret.
The Heat Is On S2, Ep18 Jan. 28, 2008 The Heat Is On Cleo plans a party at the moon pool to celebrate the one year anniversary of the girls becoming mermaids, but when Zane and Ash have an argument at the juice bar, Rikki and Emma take sides against each other and forget about the party.
The Gracie Code: Part 1 S2, Ep19 Feb. 1, 2008 The Gracie Code: Part 1 Lewis tracks down a man named Max Hamilton who has research about mermaids from 50 years ago. We discover that he knows so much because he dated a mermaid named Gracie. Max tells them about his time with Gracie and gives Lewis all the information he has.
The Gracie Code: Part 2 S2, Ep20 Feb. 8, 2008 The Gracie Code: Part 2 Charlotte finds a picture of Gracie in Cleo's room and asks her why she has a picture of her grandmother. She gets suspicious of Lewis helping the girls with a project and returns to Cleo's room when she is not there to snoop around. She finds a film and steals it. Lewis finds her at the juice bar watching the film of Gracie just as Gracie dives into the moon pool, turning into a mermaid!
Then There Were Four S2, Ep21 Feb. 15, 2008 Then There Were Four Lewis takes everything back to Max Hamilton, not realizing that he is being followed by Charlotte. When Max discovers that Charlotte is Gracie's granddaughter, he tells her everything he knows. Charlotte goes back to the moon pool during another full moon and this time goes into the water while the moon passes overhead.
Bubble, Bubble, Toil and Trouble S2, Ep22 Feb. 22, 2008 Bubble, Bubble, Toil and Trouble Everyone is shocked to discover that Charlotte is now a mermaid too. The girls reluctantly try to help her adapt to her new life, but Charlotte doesn't want to listen. She gets wet at a volleyball competition and has to run off into the water. Later she discovers that she has all 3 of the powers that Cleo, Rikki and Emma have.
Reckless S2, Ep23 Feb. 29, 2008 Reckless Nate blames Lewis for wrecking his jet ski. When Lewis refuses to pay him, Nate attempts to steal Lewis' boat, but Charlotte refuses to let Nate go, using her powers to stop the boat and bounce Nate around inside it. Cleo, Rikki and Emma get more frustrated at Charlotte's recklessness.
Three's Company S2, Ep24 Mar. 7, 2008 Three's Company Charlotte decides to throw a surprise party for Lewis but ignores all of Cleo, Rikki and Emma's advice about what he likes. She invites all her own friends and throws a party that Lewis isn't quite comfortable with. During the party she traps Cleo and Rikki in a pool room and causes a pipe to spill water all over them. Rikki saves them just before Ash discovers them in mermaid form and all 3 decide to throw Lewis their own party.
Sea Change S2, Ep25 Mar. 14, 2008 Sea Change An angry Charlotte assaults Cleo and makes Lewis promise to stay completely away from her. Feeling that Lewis has abandoned her, she becomes very upset and takes off into the ocean where no one is able to find her. When Lewis hears Cleo's message, he figures out what Charlotte has been doing and breaks up with her to find Cleo. He apologizes to Cleo and they kiss.
Unfathomable S2, Ep26 Mar. 21, 2008 Unfathomable Lewis find out that there is a way for a mermaid to lose her powers and attempts to lure Charlotte to the Moon Pool. The plan backfire and it looks like all the girls may lose their powers.
2009 The Awakening S3, Ep1 Oct. 26, 2009 The Awakening Zane has a surprise: his dad bought the café and made him manager. He renamed it after Ricky, whom he makes a full partner. Tonedeaf Nate nearly ruined the first life music performance, but Lewis saves with Irish Isabel “Bella”, whom the other mermaids just accepted after discovering she's one of them as they all abused their power to hassle playfully taunting surfers. Hunky local nature lover Will goes diving around Mako island. He discovers the magical cave, but it's a full moon and the serpentine water column knocks him out before escaping to attack the others. It …
Jungle Hunt S3, Ep2 Oct. 27, 2009 Jungle Hunt Will and Bella discover they're the new kids in school. He's determined to return to Mako island and search for the cave entrance to find out what happened to him. Bella offers to come along to keep an eye and try on him. The others decide to follow, even Angus who's convinced nothing remains to be discovered about the moon lake. During the journey Wil tells he was previously schooled at home. They arrive and manage to get Will out before the water tentacle reappears, albeit too weak to hurt anyone, unlike full moon.
Keep Your Enemies Close S3, Ep3 Oct. 28, 2009 Keep Your Enemies Close Cleo applies for the vacant job of assistant dolphin trainer, despite the water splashing risks. She's hired on trial basis by chief trainer Laurie, who ignores her utter lack of talent and chases Will, who strikes an instant friendship with star dolphin Ronny. Her humiliating failures would be fatal hadn't Will, who takes pity on her apparent aqua-phobia, brilliantly done all the work hidden underwater. Nate's band is fired by Rikki on account of its lame sound. Self-centered Belle presumes that's personal against her. For lack of an short term alternative, Zane …
Valentine's Day S3, Ep4 Oct. 29, 2009 Valentine's Day It's Valentine's Day. Belle, who can have any other boy, dreams of Will, who is concentrating on athletics and biology, oblivious of her romantic thoughts. Rikki claims she's against the commercial nonsense, yet disappointed when Zane expects her to work extra as it's one of the café's busiest days. Clio spoils Lewis's annual fishing because that's lame to a mermaid. Her kid sister Kim is driving dad mad having become flirtatious and shamelessly milks knaves Kuyle and Corey's rivaling generosity. Dad Don thus has to neglect the fishing permit officer, Sam, but ends up…
Big Ideas S3, Ep5 Oct. 30, 2009 Big Ideas Zane has bought motorbikes to earn rent from clients, but also organizes a rugged range race, offering $1,000, confident to win himself. He actively recruits competitors, greedy for their $100 entry fees, including Will who has to borrow the cash. Learning Will has experience from his parent's Andes posting, bad loser Zane enlists Nate to cheat roughly, but fails. Will's precise recollections about the aggressive Moonlake tentacle help Lewis device a test which shows the key is mixing water from the lake itself and the waterfall, albeit apparently very weak except at …
Secret and Lies S3, Ep6 Nov. 2, 2009 Secret and Lies Will orders a mono-flipper, which allows her to dive almost like a mermaid. He accepts to form a private study group with Bella, ignoring she imagines that virtually makes them a couple. Will shows her his impressive boathouse, full with treasures from his family travels, but cancels the first appointment. Having seen him receive a slightly older female there and dive with her, she assumes he's 'cheating' and meanly abuses him publicly and even under water, seconded each time by Rickie, only to find later it's just his sister Sophie. Will still forgives them. Lewis …
Happy Families S3, Ep7 Nov. 3, 2009 Happy Families Zane already hired Will's somewhat haughty sister Sophie for the job in the café Ricki wanted to give Bella, who doesn't really care after all. Dan introduces his girl-friend Samantha Roberts to his daughters. Clio is willing but can't accept swimming. Kim refuses but accepts bribery to bless their engagement.
Kidnapped S3, Ep8 Nov. 4, 2009 Kidnapped Drawing helps Will remember he lost his torch on Mako, so he decides to return there. It's a full moon, so the scared mermaids spend the night together at Clio's. Will is angry when Bella, who invited him to ask her help any time, refuses to accompany him. Suddenly a water tentacle sneaks up and drags her to the moon-lake. The moonlight had transformed her into water hadn't the others followed, so Clio can counter the effect. Lewis, who had placed a camera in the moon-lake, joins Will on the expedition, retrieves his but can't prevent Will from finding his torch …
The Sorcerer's Apprentice S3, Ep9 Nov. 5, 2009 The Sorcerer's Apprentice Lewis wants the tentacle-potential cave water safely disposed off, but the girls can't resist experimenting further behind his back. Thus Cleo's goldfish Hector gets caught in a floating bubble, which may drop him in the wild. Will, who has a school assignment appointment with Bell, is painstakingly kept away. Lewis grudgingly accepted to accompany pa Sertori as golf partner. Although he novice at the game, he proves a natural, yet decides to let Don win.
Revealed S3, Ep10 Nov. 6, 2009 Revealed Will is delighted when Bella brings him a rare deep sea fossil. He invites her to come discuss it and her music at his boathouse, but she runs when he keeps asking about her water-phobia and other quirkiness. Ricki sneaks in and realizes his study of Mako already covers all the pieces of the mermaid story puzzle. Altough nearly on kissing terms, Bella grudgingly accepts to dump him while he spills water on her and discovers she's a mermaid. She lies to be the only one, the others supposedly don't even know. After some consideration, Will promises to keep her secret.
In Over Our Heads Unknown Jan. 17, 2009 In Over Our Heads
2010 Just a Girl at Heart S3, Ep11 Unknown Just a Girl at Heart Bella thinks Sophie is mean because she coaches Will ruthlessly demanding, but that's only because she found a corporate sponsor, Don King. Will lets her act as 'guest coach', but to demonstrate her idea of facing water as your friend she dives with him when Sophie arrives with Don, so Will has to pretend he's 'too tired' to prevent her being found out as mermaid. Zane launches the café in hosting corporate functions. He leaves Ricki in charge of the first booking, but it turns out the 'junior talent agency' consists of children who want junk food and a clown. When …
Crime and Punishment S3, Ep12 Jan. 19, 2010 Crime and Punishment The café staff is flat out, so Sophie commandeers will to help out as delivery boy. He notices strange things and a fake bill as his tip. When Rikki delivers to the same men, actually counterfeiters Steve and Chris, on their boat, she sees a bag full of fake bills and is kidnapped. Will exchanges his information with Clio and Bella for the truth about the Mako mermaids, then helps them free Rikki, so they can celebrate her birthday with Lewis and Zane in the moon cave.
To Have and to Hold Back S3, Ep13 Jan. 21, 2010 To Have and to Hold Back Pa Sertori finally announces his wedding to Samantha 'Sam' Roberts. Cleo is completely out of the mood when Kim betrays that Lewis, the best man, has, unexpectedly, won an overseas three years scholarship, which he must confirm and leave for the day after the café-beach ceremony. Kim practices more sabotage. Everything works out in the end, on Mako.
Mermaid Magic S3, Ep14 Unknown Mermaid Magic Zane resents Will having become part of the team but fails to make the girls doubt his reliability. Hearing Will needs a sponsor for his competitive diving without oxygen, Zane asks a demonstration claiming the café is interested. In fact he hires Cameron and Nate so he can cheat be diving 40 meter himself and receiving oxygen. Will decides to go for 60, fair, but ends up unconscious. Ricki arrives just in time as mermaid, finds out the truth and gets him a generous contract. Meanwhile, the Moonpool study shift from the controlled tentacle to the rock which swallowed …
Power Play S3, Ep15 Unknown Power Play Laurie's Dolphin Rescue needs funds, so Will and Bella think of a rock benefit. Sophie snaps up the idea for Zane's café, with her in charge. Bella seems petty complaining about 'her idea being stolen' and refuses to play songs from the official list, which gets her band banned. Sophie messes up everything. At the Sertori home, Kim turns her sabotage efforts against Sam to the bathroom and manages to shift the blame on Cleo.
The Dark Side S3, Ep16 Unknown The Dark Side It's the next full moon, so the gang is to hold a slumber-party in the café. Zane is jealous of Will's invitation, so he invites his own rowdy mates. Kim also turns up, and as she lacks permission, pa Don, who once again is made to believe Clio just as mischievous. Ricki swims alone to the moon cave at tentacle time. Only Will arrives in time to witness the confrontation, but it turns only on him, yet she tells the others Wil saved her and swears him to secrecy.
A Magnetic Attraction S3, Ep17 Unknown A Magnetic Attraction The Sertori girls wouldn't welcome Sam's dinner guest and colleague, park ranger Ryan, until they see the handsome devil. As a natural scientist, he eagerly offers to help Clio with a 'school project', actually the gang's study of the moon cave rock, which they discovered to be strongly magnetic. Rikki is hostile to the whole idea and retreats into the cave, feeling best there. Will reluctantly breaks his word to her by telling the other mermaids about Rikki's apparent control over the tentacle, which she now refuses to presume hostile.
Into the Light S3, Ep18 Unknown Into the Light Park ranger Ryan discovers Cleo lied about the magnetic rock and sets out to explore Mako. Zane refuses to join Rikki on a secret mission, actually spying on Ryan. Will is in time to stop her after destroying his magnetometer. Seeing how the others turn away from her, Will regretfully betrays to them their tentacle experience, which only adds to her bitterness. Sam stupidly forbids Ryan to pursue his research with Park Service means.
Breakaway S3, Ep19 Apr. 13, 2010 Breakaway It's the big day for Will, Gold Coast free diving championship. 'Coach' Sophie and sponsor Zane expect him to be dead-eager, but Bella notices he cares less for winning then for loyalty to his sister. Finally he decides to do it and wins, then refuses to pursue the competitive circuit. Meanwhile Rikki had playful trouble with a dolphin, whose balls she promises Cleo to collect, and coldly dumps Zane.
Queen for a Day S3, Ep20 Unknown Queen for a Day Will tries to keep friends with everyone now Zane, who was dumped with Rikki, replaced her as manager by Sophie, with a free hand to restyle the café. Bella has a mysterious mermaid-cold, and her sneezing weird consequences that must remain hidden. So Nate coaches Cleo to step in until the allergy is determined.
The Jewel Thief S3, Ep21 Unknown The Jewel Thief Will made a jewel like Bell's from the blue crystal he found in the cave. Experiments show they attract, and when meeting cause a power-cut, to unsuspecting pa Sertori's despair during the football season finale. Ignoring Will's call for caution, the mermaids seek and find a third crystal, fro Cleo. Meanwhile Zane, who came confront Will about Rikki, finds and takes the second, which he tries to get Rikki back with, but she stands by the break-up, acting jealous about Sophie, escalating to Zane threatening to divulge the mermaids' secret.
Mako Masters S3, Ep22 Unknown Mako Masters The next new moon is at exam time. Rikki doesn't concentrate on study, wondering only about the cave and crystals, unlike Cleo, whose concentration breaks down however when she realizes the moon phase requires the mermaids to hand in their papers five minutes early. The tentacle makes it way to the mermaids earlier then expected, unstoppably, causing weird phenomena. Will has to overthrow the water-cooler, so the physics exam is canceled and rescheduled next day. Meanwhile in the cave, the tentacle reacts to the crystals by showing a comet's impact, perhaps its own …
Beach Party S3, Ep23 Unknown Beach Party It's the end of the school year and the student council organizes a beach party instead of the traditional formal dance. Sophie hopes it's time to make Zane accept Rikki broke up so he'll change the cafés name from Rikki's to Zane's. Will wants to go with Bella but after he practices asking her with Rikki, is mistakenly assumed to be her new boy-friend, so Belle asks Nate. Clio gets a telescope she assumes to be from Nate, not fiancé Lewis, but turns out to be from Ryan. Ultimately the truth gets known.
Too Close for Comfort S3, Ep24 Unknown Too Close for Comfort Zane's warning not to neglect girls' need to be the center of attention makes Will attempt to show an interest in her musical career, but that stirs trouble in Nate's band. Her lukewarm, even physically disastrous interest in his fossil collection is easier solved. Kim's nagging 'only we never go on holiday' drives dad Sertori to seek a part-time second job now trawler fishery is slow. His success as pirate captain Don however proves too tough competition for Clio's dolphin show within the marine park.
A Date with Destiny S3, Ep25 Unknown A Date with Destiny National park scientist Ryan examines why the fish is moving, so as to wreck Don's catch. Ryan's question about the moon-cave crystals, which he realizes must stem from a comet, bring him in contact with Sophie, who points out the mermaids. Zane's café is about to go bust in a week. Realizing that would cost her job, Sophie comes up with a plan: harvest the precious stones for sale, and suggests they must come from Mako. They enlist Zane to finance the necessary equipment.
Graduation S3, Ep26 Unknown Graduation Just before the gang's graduation, comet Eva approaches, which they work out is attracted by the moon cave crystals and nearly caused a major catastrophe in Ireland where it was probably diverted by a mermaid centuries ago. They frantically try to work out how, finding not the crystals are the key but the tentacle. At graduation day, Cleo gets the ideal present: Lewis is back.