TV series
H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.
Streaming, rental and purchase options
Checked Jul 22, 2026
H2O: Just Add Water is available to stream on Netflix, Prime Video, Hoopla, Pluto TV, and The Roku Channel in United States. You can also rent or buy it from Google Play, Amazon, Apple TV, and Fandango at Home. Use the direct links below to open the provider.
H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.
Choose an episode, then use the watch options above for the show.
Episode 1
Three very different teenage girls, Emma, Cleo and Rikki, facing everyday teenage problems. With a twist: they're mermaids; after discovering a magic place where they are given incredible powers over water that change their lives forever.
Directed by Colin BuddsWritten by Philip DalkinGuest stars Burgess Abernethy, Cleo Massey, Jamie Timony, Ariu Lang Sio
Episode 2
Miriam is having a pool party and Cleo considers going despite the risks of being around water. Meanwhile, Emma contemplates her future as a swimmer and Rikki makes a new discovery.
Directed by Colin BuddsWritten by Deb CoxGuest stars Burgess Abernethy, Cleo Massey, Annabelle Stephenson, Jamie Timony, Christopher Poree, Alice Hunter, Jared Robinsen, Caroline Kennison
Episode 3
Rikki, Emma and Cleo discover that sea turtles are being captured by fishing nets. When Rikki and Emma attempt to rescue the turtles by cutting the nets, it causes the fisherman to think that there is a rogue shark roaming their ocean.
Directed by Colin BuddsWritten by Simon ButtersGuest stars Cleo Massey, Christopher Poree, Deborah Coulls, Chris Palframan, Damon Gabso, Alan David Lee, Ariu Lang Sio
Episode 4
Emma decides that she is not going to have her annual sleepover party due to what has happened to them. But Rikki and Cleo try to convince her otherwise. Meanwhile, Lewis conducts experiments on the girls.
Directed by Colin BuddsWritten by Anthony MorrisGuest stars Burgess Abernethy, Christine Amor, Annabelle Stephenson, Alice Hunter, Caroline Kennison, Andrea Moore, Ashleigh Lawrence, Candice Dixon
Episode 5
Cleo's sister Kim finds her diary and thinks that Cleo and her friends are 'evil mermaids' and she plans to tell everyone. Meanwhile, Lewis goes to Mako Island to find out more about what happened to the girls.
Directed by Colin BuddsWritten by Joanne WatsonGuest stars Cleo Massey, Trent Sullivan, Annabelle Stephenson, Alice Hunter, Jared Robinsen, Caroline Kennison, Deborah Coulls, Andrea Moore
Episode 6
Emma gets into trouble babysitting her little brother Elliot. She goes to Lewis for help when Elliot develops a crush on Rikki.
Directed by Colin BuddsWritten by Sam CarrollGuest stars Burgess Abernethy, Trent Sullivan, Jamie Timony, Christopher Poree, Jared Robinsen, Caroline Kennison, Preton Forsythe, Ariu Lang Sio
Episode 7
Miss Chatham gives Cleo a warning that she doesn't quite understand. Until Emma finds herself in a trance and unable to change back from a mermaid under a full moon.
Directed by Colin BuddsWritten by Max DannGuest stars Burgess Abernethy, Christine Amor, Trent Sullivan, Annabelle Stephenson, Christopher Poree, Jared Robinsen, Caroline Kennison, Arna-Maria Winchester
Episode 8
Lewis is offered a great job with a marine biologist, but the girls are concerned that his interest will cause him to reveal too much information
Directed by Colin BuddsWritten by Chris AnastassiadesGuest stars Lara Cox, Michael Parlato
Episode 9
Rikki is offered a job to collect rare fish. At first it seems perfectly fine, until she finds out the person that hired her is selling the fish for large profits.
Directed by Colin BuddsWritten by Anthony MorrisGuest stars Cleo Massey, Cory Robinson, Ariu Lang Sio
Episode 10
Rikki enters a short film contest on the theme of 'Heroes' and decides to capture some nice underwater footage with her 'abilities'. Meanwhile, Emma is interviewing her mum and Zane and Lewis are planning to rennact Dr. Bennet's windsurfing record.
Directed by Colin BuddsWritten by Deb CoxGuest stars Burgess Abernethy, Caroline Kennison, Joss McWilliam, Ariu Lang Sio
Episode 11
Byron asks Emma for help with training the school's swimming team and Emma has some trouble deciding whether or not to help out in her current situation. Meanwhile, Lewis continues to experiment on the girls, which annoys Rikki.
Directed by Colin BuddsWritten by Max DannGuest stars Burgess Abernethy, Annabelle Stephenson, Jamie Timony, Christopher Poree, Caroline Kennison
Episode 12
The full moon gives Cleo a power to put guys in a 'trance' and she suddenly gets a rush of admirers.
Directed by Colin BuddsWritten by Susan MacGillicuddyGuest stars Burgess Abernethy, Christine Amor, Cleo Massey, Annabelle Stephenson, Christopher Poree, Deborah Coulls, Alan David Lee, Ariu Lang Sio
Episode 13
Emma invites Miss Chatham to stay at her place and Zane overhears Miss Chatham's concerns about 'her treasure'.
Directed by Colin BuddsWritten by Philip DalkinGuest stars Burgess Abernethy, Christine Amor, Trent Sullivan, Jamie Timony, Jared Robinsen, Caroline Kennison, Steven Tandy
Episode 14
Cleo's 16th birthday is approaching and she thinks that her father is going to throw another embarrasing birthday party. Meanwhile, Zane tries to find the 'sea monster' that he saw when he almost drowned.
Directed by Jeffrey WalkerWritten by Chris AnastassiadesGuest stars Burgess Abernethy, Cleo Massey, Jamie Timony, Deborah Coulls, Alan David Lee, Ariu Lang Sio
Episode 15
Emma is doing well at her new job at the JuiceNet cafe, but when she is left in charge, she has trouble managing her new employee, Rikki.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Annabelle Stephenson
Episode 16
Rumour has it that Cleo has a boyfriend and her friends and family are trying to find out who he is. Meanwhile, Zane continues his search for the 'sea monster' he saw.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Paul Bishop, Annabelle Stephenson
Episode 17
The girls have to fake sick as a result of a thunderstorm, so their secret won't be discovered at school. But their 'sickness' attracts the attention of doctors.
Directed by Jeffrey WalkerGuest stars Kate Fitzpatrick, Emelia Burns
Episode 18
Zane's quest to find the 'sea monster' has led him to Mako Island. Rikki loses control of her powers as a result of the full moon and Zane finds her.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Annabelle Stephenson
Episode 19
Cleo and Kim are stuck with their cousin Angela who wants to go body boarding and causes a bird brained distraction when Cleo refuses.
Directed by Jeffrey WalkerGuest stars Paul Bishop
Episode 20
Lewis enters the annual fishing derby. When Cleo sees him struggling, she decides to help him out with disastorous consequnces. Meanwhile, Rikki and Zane are trapped on a hotel balcony.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy
Episode 21
Emma decides to change her look by colouring her hair red. Though nothing is that simple when you're half-mermaid. Zane asks Rikki out on a date.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Annabelle Stephenson
Episode 22
Emma and Cleo are concerned about Rikki going out with Zane. They force Rikki to decide to either be with Zane or with them.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy
Episode 23
Rikki finds a locket that looks the same as Miss Chatham's in a Jewellery shop and she is determined to get it.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Annabelle Stephenson, Ashleigh Brewer
Episode 24
With the school dance coming up, Emma and Cleo hope Byron and Lewis will ask them out. Meanwhile, Miss Chatham and Lewis argue about which has more merit – magic or science.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Annabelle Stephenson
Episode 25
It's time for Emma's family's annual vacation trip, but she can't go as the risks are too high. But all her excuses don't go very well with her family. Meanwhile, with the return of Dr Denman, Zane is closer than ever to cracking the girl's secret.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Lara Cox
Episode 26
Dr Denman sets up a trap for the girls at Mako Island and Zane is forced to decide who he should be helping.
Directed by Jeffrey WalkerGuest stars Burgess Abernethy, Lara Cox, Christine Amor
Episode information updated Jul 23, 2026
Phoebe TonkinCleo Sertori
Claire HoltEmma Gilbert
Cariba HeineRikki Chadwick
Indiana EvansIsabel "Bella" Hartley
Luke MitchellWill Benjamin
Angus McLarenLewis McCartney
Burgess AbernethyZane Bennett
10Australia
Jonathan M. Shiff ProductionsAustralia
Network TenAustralia
ZDFGermany
