Double Trouble (H2O: Just Add Water)

H2O: Just Add Water

Company type	Television series
Industry	Entertainment
Founded	July 7, 2006 (2006-07-07)
Headquarters	Australia
Area served	Worldwide (over 120 countries)

The following section presents a comprehensive episode guide for the Australian TV series H₂O: Just Add Water. Originally broadcast on Network Ten in Australia, the show has since reached audiences in more than 120 countries worldwide. The debut of the first season occurred on 7 July 2006, followed by the second season starting on 28 September 2007. The third season premiered first in the United Kingdom on 26 October 2009, before its Australian release on 22 May 2010.

Series overview

Season		Number of episodes	Original broadcast dates
			Premiere date	Finale date
	1	26	7 July 2006 (2006-07-07)	29 December 2006 (2006-12-29)
	2	26	28 September 2007 (2007-09-28)	21 March 2008 (2008-03-21)
	3	26	26 October 2009 (2009-10-26) (UK)	16 April 2010 (2010-04-16) (UK)

Series 1 (2006)

Emma Gilbert (Claire Holt), Cleo Sertori (Phoebe Tonkin), and Rikki Chadwick (Cariba Heine) are three adolescent girls who find themselves stranded on Mako Island. Upon discovering a subterranean pool, they realize that contact with water causes them to transform into mermaids, each endowed with distinct aquatic abilities: Emma has the power to freeze water, Cleo can manipulate its shape and volume, and Rikki is capable of heating it to boiling point. They recruit Cleo’s friend Lewis McCartney (Angus McLaren) to assist in uncovering the source of their powers and to help keep their secret safe. The storyline intertwines their typical teenage experiences with the challenges of controlling their newfound abilities.

The inaugural season focuses on the girls’ journey as they come to terms with their transformations while encountering threats from marine scientist Dr. Denman (Lara Cox) and Zane Bennett (Burgess Abernethy), who becomes fixated on the mermaids after catching sight of Emma’s tail. Louise Chatham (Christine Amor), a former mermaid herself, provides guidance as they navigate dangers linked to their condition. The season concludes with the trio temporarily losing their powers during a lunar eclipse as a strategy to avoid capture, only to have them restored soon afterward.

Template:Episode listTemplate:Episode listTemplate:Episode list {{Episode list ... [Additional episode details omitted for brevity] ... }}

Overall No.	Episode No.	Episode Title	Director	Writer	First Broadcast Date	Production Code

Series 2 (2007–08)

During a rare planetary alignment coinciding with the full moon at Mako Island's moon pool, the girls' abilities become significantly amplified. This season introduces Charlotte Watsford (Brittany Byrnes), who relocates to the Gold Coast and soon develops feelings for Lewis. Upon learning that her grandmother Gracie was a mermaid, Charlotte encounters Max Hamilton (Martin Vaughan), who enlightens her about the history of past mermaids and the mysteries of Mako Island. Charlotte ultimately transforms into the fourth mermaid, inheriting the combined powers of the others; however, her pride causes tension within the group and eventually leads to her permanent loss of mermaid abilities.

Romantic relationships also take center stage: Cleo ends her relationship with Lewis due to his overprotectiveness; Lewis briefly dates Charlotte but returns to Cleo after recognizing his deeper commitment to the girls. Meanwhile, Rikki and Zane rekindle their romance, and Emma reveals her mermaid identity to Ash (Craig Horner), adding complexity to their relationship.

Template:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode list {{Episode list Title=Fish Fever OriginalAirDate={{Start date 2007 12 14 df=y}} EpisodeNumber=38 EpisodeNumber2=12 ProdCode=212 DirectedBy=Jeffrey Walker WrittenBy=Philip Dalkin ShortSummary=A poisonous coral fragment causes illness in Emma and threatens their fish tank companion's health, risking exposure of their secret as they search for a cure before Emma’s parents find out. LineColor=00AAFF }} {{Episode list Title=Moonwalker OriginalAirDate={{Start date 2007 12 21 df=y}} EpisodeNumber=39 EpisodeNumber2=13 ProdCode=213 DirectedBy=Jeffrey Walker WrittenBy=Chris Roache ShortSummary>Cleo’s family camping trip coincides with Mako Island’s full moon, intensifying powers and tensions among the girls and Charlotte as they strive to protect their secret. LineColor=00AAFF }} {{Episode list Title=Get Off My Tail OriginalAirDate={{Start date 2007 12 28 df=y}} EpisodeNumber=40 EpisodeNumber2=14 ProdCode=214 DirectedBy=Colin Budds WrittenBy=Sam Carroll ShortSummary=Cleo attempts to regain Lewis’s friendship through her mermaid powers amidst rivalry with Charlotte. Meanwhile, Ash assumes management of JuiceNet café, initially firing then rehiring Emma after disruptions follow his changes. LineColor=00AAFF }} {{Episode list Title=Irresistible OriginalAirDate=Template:Start date 2008 1 4 df=y EpisodeNumber=41 EpisodeNumber2=15 ProdCode=215 DirectedBy=Colin Budds WrittenBy=Chris Anastassiades ShortSummary>An ambergris bottle draws Emma, Rikki, and Cleo toward Nate, endangering their secrecy when he uses it at JuiceNet café despite warnings from Lewis and Zane. LineColor=00AAFF }} {{Episode list Title=Double Trouble OriginalAirDate=Template:Start date 2008 1 11 df=y EpisodeNumber=42 EpisodeNumber2=16 ProdCode=216 DirectedBy=Colin Budds WrittenBy=Simon Butters ShortSummary>While chaperoning her younger siblings’ date, Lewis experiences nightmares about Cleo's secret being revealed; Emma suspects Rikki’s secret meetings with Ash may have hidden motives. LineColor==00AAFF }} {{Episode list Title=Moonstruck OriginalAirDate=Template:Start date 2008 1 18 df=y EpisodeNumber=43 EpisodeNumber2=17 ProdCode=217 DirectedBy=Colin Budds WrittenBy=Philip Dalkin ShortSummary>During a full moon, Emma's anxiety about revealing her identity intensifies as Ash nearly uncovers her secret amid chaotic events affecting the girls. Absent: Brittany Byrnes as Charlotte Watsford LineColor==00AAFF }} {{Episode list Title='The Heat is On' OriginalAirDate=Template:Start date 2008 1 25 df=y EpisodeNumber='44' EpisodeNumber2='18' ProdCode='218' DirectedBy='Colin Budds' WrittenBy='Philip Dalkin' ShortSummary='The girls commemorate their one-year anniversary as mermaids with a gathering at Mako Island amid misunderstandings causing friction between Emma and Zane involving Ash.' LineColor='00AAFF' }} {{Episode list Title='The Gracie Code, Part One' OriginalAirDate=Template:Start date 2008 2 1 df=y EpisodeNumber='45' EpisodeNumber2='19' ProdCode='219' DirectedBy='Colin Budds' WrittenBy='Max Dann' ShortSummary>Lewis discovers Max Hamilton’s research on Mako Island and forms an alliance after Max recognizes Cleo's locket linked to his former relationship with Gracie, vowing to keep the mermaids’ legacy confidential. Absent: Claire Holt as Emma Gilbert LineColor=='00AAFF' }} {{Episode list Title='The Gracie Code, Part Two' OriginalAirDate=Template:Start date 2008 2 8 df=y EpisodeNumber='46' EpisodeNumber2='20' ProdCode='220' DirectedBy='Colin Budds' WrittenBy='Anthony Morris' ShortSummary>Charlotte uncovers she is Gracie's granddaughter after taking Max's research film exposing Gracie as a mermaid, heightening suspicion about their secrets while Ash grows increasingly curious about Emma. LineColor=='00AAFF' }} {{Episode list Title='And Then There Were Four' OriginalAirDate=Template:Start date 2008 2 15 df=y EpisodeNumber='47' EpisodeNumber2='21' ProdCode='221' DirectedBy='Colin Budds' WrittenBy='Susan MacGillicuddy' ShortSummary>Charlotte receives full revelation of her heritage from Max and becomes a mermaid during Mako Island's full moon while others are distracted by lunar events. LineColor=='00AAFF' }} {{Episode list Title='Bubble, Bubble, Toil and Trouble' OriginalAirDate=Template:Start date 2008 2 22 df=y EpisodeNumber='48' EpisodeNumber2='22' ProdCode='222' DirectedBy='Colin Budds' WrittenBy='Sam Carroll' ShortSummary>The group reluctantly accepts Charlotte despite concerns over her wielding all their combined powers and asserting superiority during school volleyball matches. LineColor=='00AAFF' }} {{Episode list Title='Reckless' OriginalAirDate=Template:Start date 2008 2 29 df=y EpisodeNumber='49' EpisodeNumber2='23' ProdCode='223' DirectedBy='Colin Budds' WrittenBy='Max Dann' ShortSummary>Charlotte refuses assistance in managing her powers and recklessly uses them publicly, causing damage and nearly exposing their secret before intervention by the others contains her behavior. LineColor=='00AAFF' }} {{Episode list Title='Three's Company' OriginalAirDate=Template:Start date 2008 3 7 df=y EpisodeNumber='50' EpisodeNumber2='24' ProdCode='224' DirectedBy='Colin Budds' WrittenBy='Sam Carroll' ShortSummary>Charlotte dominates planning for Lewis’ birthday party, creating divisions within the group until they reveal how her actions jeopardize their identities leading to her exclusion once again. LineColor=='00AAFF' }} {{Episode list Title='Sea Change' OriginalAirDate=Template:Start date 2008 3 14 df=y EpisodeNumber='51' EpisodeNumber2='25' ProdCode='225' DirectedBy='Colin Budds' WrittenBy='Robert Armin' ShortSummary>Charlotte alienates Cleo and manipulates Lewis into distancing himself from Cleo until he recognizes Charlotte's deceit following Cleo’s rescue from danger and ends their relationship. LineColor=='00AAFF' }} {{Episode list Title='Unfathomable' OriginalAirDate=Template:Start date 2008 3 21 df=y EpisodeNumber='52' EpisodeNumber2='26' ProdCode='226' DirectedBy='Colin Budds' WrittenBy='Chris Roache' ShortSummary>A potent full moon threatens permanent loss of the girls’ powers as they confront Charlotte's aggression in a climactic battle concluding with her losing abilities and Emma revealing her secret to Ash. Note: Final appearances of Claire Holt, Brittany Byrnes, and Craig Horner LineColor=='00AAFF' }}

No.	Ep. No.	Title	Directed by	Written by	Original air date	Prod. code

Series 3 (2009–10)

The third series centers on Cleo and Rikki as they adjust to Emma's absence while she is away with her family. Introduced are new characters such as Bella Hartley (Indiana Evans), a mermaid and singer who possesses the ability to transform water into gelatine, and Will Benjamin (Luke Mitchell), a diver exploring Mako Island who unintentionally triggers a phenomenon causing water to become hostile toward mermaids. Additionally, the season delves into Zane's efforts to harness the Moon Pool's power following his breakup with Rikki.

Template:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode listTemplate:Episode list {{Episode list Title=Crime & Punishment OriginalAirDate={{Start date 2010 1 19 df y}} (UK) EpisodeNumber 64 EpisodeNumber2 12 ProdCode 312 DirectedBy Jeffrey Walker WrittenBy Max Dann ShortSummary On Rikki's birthday, suspicions about Bella’s secret arise after an unusual gift is found. A counterfeit money scheme threatens the café leading to Rikki's abduction, forcing mermaids and Will to collaborate for her rescue. LineColor 00FFFF }} {{Episode list Title To Have & to Hold Back OriginalAirDate={{Start date 2010 1 21 df y}} (UK) EpisodeNumber 65 EpisodeNumber2 13 ProdCode 313 DirectedBy=Jeffrey Walker WrittenBy=Simon Butters ShortSummary Don and Sam’s wedding faces sabotage from Kim amidst family conflicts. Lewis considers a research opportunity in the US but opts for love over career advancement. The girls arrange a second wedding ceremony on Mako Island. LineColor 00FFFF }} {{Episode list Title Mermaid Magic OriginalAirDate=Template:Start date 2010 2 22 df y (UK) EpisodeNumber 66 EpisodeNumber2 14 ProdCode 314 DirectedBy Colin Budds WrittenBy Anthony Morris ShortSummary Cleo discovers crystals connected to Moon Pool magic while Will pushes his free-diving limits dangerously, prompting Rikki to rescue him. LineColor 00FFFF }} {{Episode list Title Power Play OriginalAirDate=Template:Start date 2010 2 23 df y (UK) EpisodeNumber 67 EpisodeNumber2 15 ProdCode 315 DirectedBy Colin Budds WrittenBy Anthony Morris ShortSummary Bella organizes a fundraiser for Dolphin Rescue at the café but faces sabotage from Sophie who alienates bands and is eventually dismissed. Meanwhile, tensions rise among Cleo, Sam, and Kim over shared spaces. LineColor 00FFFF }} {{Episode list Title The Dark Side OriginalAirDate=Template:Start date 2010 2 24 df y (UK) EpisodeNumber 68 EpisodeNumber2 16 ProdCode 316 DirectedBy Colin Budds WrittenBy Sam Carroll ShortSummary During a full moon on Mako Island, Rikki confronts the water tentacle and appears able to control it, deepening mysteries about its motives as she makes Will promise confidentiality. LineColor 00FFFF }} {{Episode list Title A Magnetic Attraction OriginalAirDate=Template:Start date 2010 2 25 df y (UK) EpisodeNumber69 EpisodeNumber27017 ProdCode317 DirectedBy Colin Budds WrittenBy Sam Carroll ShortSummary As Cleo introduces geophysicist Ryan to magnetic crystals from Mako Island, tensions rise; Rikki fears exposure while relationships become strained due to Will’s revelations about Rikki’s link to the tentacle. LineColor00FFFF }} {{Episode list Title Into the Light OriginalAirDate=Template:Start date2010-04-12 df y(UK) EpisodeNumber70 EpisodeNumber2718 ProdCode318 DirectedBy Colin Budds WrittenBy Sam Carroll ShortSummary Ryan investigates magnetic rocks on Mako Island after learning their value but inadvertently discovers the Moon Pool cavern. Rikki uses her powers to repel him yet realizes this heightens risk; reconciliation follows as mysteries surrounding the tentacle deepen. LineColor00FFFF }} {{Episode list Title Breakaway OriginalAirDate=Template:Start date2010-04-13 df y(UK) EpisodeNumber71 EpisodeNumber2719 ProdCode319 DirectedBy Colin Budds WrittenBy Anthony Morris ShortSummary Will frees himself from Sophie’s competitive demands by setting a new free-diving record before quitting competitions; meanwhile, Rikki ends her relationship with Zane after witnessing his betrayal involving Sophie. LineColor00FFFF }} {{Episode list Title Queen for a Day OriginalAirDate=Template:Start date2010-04-13 df y(UK) EpisodeNumber72 EpisodeNumber2720 ProdCode320 DirectedBy Colin Budds WrittenBy Samantha Strauss ShortSummary Following her breakup with Zane, Rikki steps down from managing the café which Sophie eagerly takes over, hiring Kim as waitress. Bella struggles with an allergic reaction that triggers her powers during performances under Sophie’s strict management. LineColor00FFFF }} {{Episode list Title The Jewel Thief OriginalAirDate=Template:Start date2010-04-14 df y(UK) EpisodeNumber73 EpisodeNumber2721 ProdCode321 DirectedBy Colin Budds WrittenBy Simon Butters ShortSummary After rescuing someone during a dive, Rikki crafts magnetic crystal necklaces symbolizing friendship between mermaids and Will. Jealousy drives Zane to steal one necklace but he is confronted by Rikki reaffirming their breakup. LineColor00FFFF }} {{Episode list Title Mako Masters OriginalAirDate=Template:Start date2010-04-14 df y(UK) EpisodeNumber74 EpisodeNumber2722 ProdCode322 DirectedBy Colin Budds WrittenBy Philip Dalkin ShortSummary Stressed over exams, Cleo leads study sessions while Bella and Rikki concentrate on interpreting messages from crystal necklaces projecting an image of an Earth-bound comet threatening the planet—prompting urgent action plans amid disruptions from Zane and Will. LineColor00FFFF }} {{Episode list Title Beach Party OriginalAirDate=Template:Start date2010-04-15 df y(UK) EpisodeNumber75 EpisodeNumber2723 ProdCode323 DirectedBy Colin Budds WrittenBy Anthony Morris ShortSummary At a large Gold Coast beach party, misunderstandings occur among Bella, Will, Nate, and Rikki before clarifications lead to Bella and Will becoming a couple; meanwhile Sophie pressures Zane to rebrand the café. LineColor00FFFF }} {{Episode list Title Too Close for Comfort OriginalAirDate=Template:Start date2010-04-15 df y(UK) EpisodeNumber76 EpisodeNumber2724 ProdCode324 DirectedBy Colin Budds WrittenBy Max Dann ShortSummary Kim demands an expensive vacation prompting Don to take on a second job at the marine park which threatens Cleo's dolphin trainer role amid audience changes; meanwhile Bella and Will face challenges bridging their mermaid-human differences. LineColor00FFFF }} {{Episode list Title A Date with Destiny OriginalAirDate=Template:Start date2010-04-16 df y(UK) EpisodeNumber77 EpisodeNumber2725 ProdCode325 DirectedBy Colin Budds WrittenBy Chris Roache ShortSummary The girls simulate a full moon event to complete viewing of the Moon Pool message revealing an Earth-bound comet drawn by magnetic forces near Mako Island; they devise strategies using magnetic crystals to divert it while Sophie exploits crystal value leading Ryan directly to Mako Island despite exposure risks. LineColor00FFFF }} {{Episode list Title Graduation OriginalAirDate=Template:Start date2010-04-16 df y(UK) EpisodeNumber78 EpisodeNumber2726 ProdCode326 DirectedBy Colin Budds WrittenBy Joss King ShortSummary Harvesting crystals damages Moon Pool power threatening Earth as comet approaches; united magic from Bella, Cleo, and Rikki successfully deflects it. The season concludes with their graduation celebration and Lewis's return home signaling future developments. Guest starring: Angus McLaren as Lewis McCartney LineColor00FFFF }}

No. overall	No. in series	Title	Directed by	Written by	Original air date	Production code

Compilation TV films

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Title	Original air date

References

General references

External links

• Episode guide at the Internet Movie Database