H2O: Just Add Water Crossovers
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One Moon Cycle by TasiMom reviews
I had this idea floating around about how both shows are connected with a back story. The premise is that Rita lied when she said Harry died. Harry is Harrison Bennett. I hope you enjoy it. The story takes place shortly after the last season of Mako. Not all relationships are going to be the same. So, if you don't want changes, then this might not be the story for you.
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: T - English - Fantasy/Drama - Chapters: 5 - Words: 5,829 - Reviews: 8 - Favs: 3 - Follows: 5 - Updated: 8h - Published: 2/14 - Harrison B., Rita S.
Power Rangers Dino Thunder: Might of a Dragon by Chris Rudy
Six students become chosen to be the new team of Power Rangers. What happens when half of these new Rangers are discovered to be hiding something from their teammates? Find out in this story.
Crossover - Power Rangers & H2O: Just Add Water - Rated: T - English - Chapters: 1 - Words: 3,727 - Favs: 1 - Follows: 2 - Published: 2/16
H2O: Just Add Daemons by Rjalker
...Most likely going to be a collection of one-shots, because my brain isn't really hard-wired to write actual chapter-stories. Cleo/Emma/Rikki will be the endgame ship. I'll update the tags once more characters are actually involved. Explanations for daemons will come in later chapters.
Crossover - His Dark Materials & H2O: Just Add Water - Rated: T - English - Chapters: 1 - Words: 1,277 - Follows: 1 - Published: 2/4 - Rikki C., Cleo S.
Float by Spiziri reviews
The end of the summer is rapidly approaching for our heroes, but Sally has one last adventure for Percy and Annabeth in Australia.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: K+ - English - Fantasy/Humor - Chapters: 19 - Words: 72,641 - Reviews: 186 - Favs: 131 - Follows: 232 - Updated: 2/1 - Published: 5/13/2015
TVD or H2O? by batsuey
Cleo and Emma find themselves in an alternate reality as a werewolf and an Original vampire respectively. They will need the help of Elena and everyone to get home. Some of the people though such as Caroline and Tyler have axes to grind with the mermaids' doppelganger counterparts. Will the mermaids ever find a way home to their own reality?
Crossover - H2O: Just Add Water & Vampire Diaries - Rated: T - English - Romance/Fantasy - Chapters: 2 - Words: 1,182 - Follows: 2 - Updated: 1/29 - Published: 11/11/2016 - Cleo S., Emma G., Elena G., Stefan S.
Secrets of the sea by flora swan reviews
Bella goes on holiday but her life changes when she was transformed into a mermaid. She gets close with Rikki, Bella H and Cleo so she was aloud to stay there cause she wanted to stay there because she didn't want to go back to Forks cause of Jacob said to her. Bella falls in love when she was there.
Crossover - Twilight & H2O: Just Add Water - Rated: K - English - Friendship/Supernatural - Chapters: 2 - Words: 2,110 - Reviews: 33 - Favs: 53 - Follows: 67 - Updated: 12/18/2016 - Published: 3/25/2016 - Bella, Rikki C., Cleo S., Bella H.
Beauties and beasts by Startraveler93 reviews
An accident releases a group of inhabitants from the Amazon in the waters Mako island and Gold Coast. What happens when Cleo, Emma, Bella and Rikki find themselves facing adversaries who are marveled by their beauty, how far will theses visitors go to get them to be with them?
Crossover - H2O: Just Add Water & Creature from the Black Lagoon - Rated: T - English - Romance/Friendship - Chapters: 2 - Words: 4,507 - Reviews: 1 - Favs: 3 - Follows: 4 - Updated: 12/10/2016 - Published: 12/4/2016 - Rikki C., Cleo S., Emma G., Bella H.
H2amilton by Thomassjefferson reviews
Enjoy, bitches.
Crossover - H2O: Just Add Water & Hamilton - Rated: T - English - Romance/Western - Chapters: 5 - Words: 8,374 - Reviews: 12 - Favs: 1 - Follows: 3 - Updated: 12/1/2016 - Published: 7/28/2016 - A. Hamilton, G. Washington
OUAT and H20 Fanfic The Five Siblings Who Believed In Fairytales by BreeOUAT
Rikki, Abby,Henry and Sam have always wanted to meet their birth mother, so when Rikki decides to meet her, Abby, Henry and Sam jump at the chance to meet her. Not only that, Rikki, Abby,Henry and Sam have two half siblings. And Sam, Rikki and Abby, Rhianna, Emma, Cleo, Paige and Roland go through an incredible, out of this life changing transformation that changes them forever
Crossover - H2O: Just Add Water & Once Upon a Time - Rated: K+ - English - Friendship/Fantasy - Chapters: 1 - Words: 6,382 - Published: 11/29/2016 - Rikki C., Emma G., Emma S., Henry Mills
Another Swan! by Mermaid's Magic reviews
Alexander is the twin brother of Bella,he has moved to Forks with his sister. The wettest place on land,now he doesn't mind the rain or the cold but with his secret that happens to pop up after a drop of water gets onto him,well he is every glade for his power to shield himself from the water. And he has two protective Mates and some good friends to help him along the way!
Crossover - Twilight & H2O: Just Add Water - Rated: T - English - Supernatural/Family - Chapters: 1 - Words: 2,034 - Reviews: 3 - Favs: 10 - Follows: 13 - Published: 11/24/2016
Dino Thunder: The Ocean's Roar (The Rewrite Edition) by Aquaprincess3 reviews
After being forced to move to Reefside by her aunt, Kaitlyn along with three other students are thrown into the dangerous life of being the Earth's newest protectors. But being the Silver Dino Thunder Ranger isn't the only secret Kaitlyn's forced to keep hidden. Can she trust her new teammates with this secret? Or will it tear them apart and help lead Mesogog to victory?
Crossover - Power Rangers & H2O: Just Add Water - Rated: T - English - Fantasy/Romance - Chapters: 23 - Words: 93,146 - Reviews: 41 - Favs: 41 - Follows: 36 - Updated: 11/24/2016 - Published: 12/21/2015
Mermaid in Manhattan by Catdragon513 reviews
Moving to New York wasn't exactly the worst thing to happen to mermaid Jacqueline Thompson. She was prepared to be content with her new life, that was until some twist of fate exposed her secret to some of the most dangerous people in the world, the Avengers. Now she has to deal with a new school, a new city, and a new life. (sporadic updates)
Crossover - H2O: Just Add Water & Avengers - Rated: T - English - Fantasy/Adventure - Chapters: 36 - Words: 65,108 - Reviews: 93 - Favs: 106 - Follows: 132 - Updated: 10/28/2016 - Published: 8/16/2013 - Cleo S., Captain America/Steve R., Iron Man/Tony S., Nick F.
A Mermaid In Forks by NikkiM95 reviews
When Bella decided to move to Forks, she didn't take into account that it's the wettest place in the US. And to make things worse, in enters Edward, the unbelivably handsome guy who saves her life. But can she figure out his secret before he figures out hers while she develops feelings for the golden eyed mystery guy. Can they overcome obstacles and find Love?
Crossover - Twilight & H2O: Just Add Water - Rated: T - English - Romance/Supernatural - Chapters: 13 - Words: 50,751 - Reviews: 151 - Favs: 236 - Follows: 266 - Updated: 10/15/2016 - Published: 9/24/2012 - Bella, Edward
merman of H2o by foxwolf101 reviews
harry found out he have more family out their that want to take him harry is part merman when he turn 16 was james a merman or just in his family blood for decades find out when his cousin Cleo found out about...
Crossover - Harry Potter & H2O: Just Add Water - Rated: T - English - Adventure/Supernatural - Chapters: 3 - Words: 1,410 - Reviews: 7 - Favs: 14 - Follows: 25 - Updated: 10/10/2016 - Published: 4/14/2016
Life as a mermaid: Annabeth Chase by xxXThalico-loverXxx reviews
On a trip to Mako island, Annabeth turns into a mermaid. How will everyone react? Will she be able to keep her secret? What powers does she have? Find out in this fic.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: K - English - Adventure/Drama - Chapters: 2 - Words: 2,249 - Reviews: 2 - Favs: 7 - Follows: 7 - Updated: 10/3/2016 - Published: 8/17/2016 - Annabeth C.
Merpeople vs Humans by Angel of Red Fire reviews
Merpeople exist! After many unexplained phenomena that begin to bring chaos and destruction to the world, the world of mermaids and mermen are exposed to the people of earth. War threatens to break out. Mako Island has more secrets that are revealed and an all powerful, out of control mermaid must be stopped.
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: T - English - Fantasy/Suspense - Chapters: 11 - Words: 20,693 - Reviews: 14 - Favs: 1 - Follows: 2 - Updated: 10/2/2016 - Published: 8/11/2016 - Charlotte W., OC, Zac B., Mimmi - Complete
A Mermaids Tear by Mermaid's Magic reviews
What if Cleo was not the birth daughter of Don and Bev Sertori? What if Kim and Cleo didn't really hate each other? What if Emma and Rikki didn't like Cleo? What if Lewis was two timing her with Charlotte? Who will be Cleo's new love? Why am I asking you these questions when I wont answer them? That is because you will just have to read to find the answers out for yourselves! G.L.
Crossover - Jurassic Park & H2O: Just Add Water - Rated: T - English - Fantasy/Romance - Chapters: 4 - Words: 4,010 - Reviews: 4 - Favs: 11 - Follows: 12 - Updated: 9/29/2016 - Published: 3/23/2016 - [Owen, Cleo S.] [Zach M., Kim S.]
Deep Red by Sellybelly411 reviews
Emma has returned to Australia! Cleo, Rikki, and Bella are overjoyed to have her back. Lyla, Nixie, and Sirina are having trouble re-gaining Zac's trust. Meanwhile there's some trouble brewing in the sky. A blood moon. It can turn our four into permanant mermaids forever. Can Lyla and the others figure out what they are before it's to late?
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: K+ - English - Fantasy/Adventure - Chapters: 8 - Words: 3,866 - Reviews: 26 - Favs: 21 - Follows: 24 - Updated: 9/26/2016 - Published: 1/9/2015
H2O: Just add Half Bloods by xxXThalico-loverXxx reviews
The seven, Nico, and Thalia are in Gold Coast, Australia for vacation. When Nico meets his best friend from high school, Bella, What happens? Takes place in the events of season 3. All major couples and and Thalico. No Bella/Will until end.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: T - English - Romance/Adventure - Chapters: 1 - Words: 2,049 - Reviews: 5 - Favs: 5 - Follows: 8 - Published: 8/11/2016 - Nico A., Bella H.
The Truth About The Mermaids by Ottsel Cath reviews
Rikki said that she and her friends would be interested in meeting the pod. A couple of months later, Rikki organised everything so they would be able to do so. Will they finally be able to learn the truth about themselves? One-shot. I have also posted this story in the Mako Mermaids fanfiction archive under the title The Truth About Them :)
Crossover - H2O: Just Add Water & Mako Mermaids - Rated: K - English - Humor/Fantasy - Chapters: 1 - Words: 5,189 - Reviews: 4 - Favs: 15 - Follows: 7 - Published: 7/30/2016 - Rikki C., Cleo S., Emma G., Bella H. - Complete
Learning To Trust For The First Time Ever by BreeOUAT
Sam's never had a good foster home- she became mute when she was just 3 years old due to child abuse. When Sam and Abby's foster father hurts Sam, Abby decides she has had enough. She takes Sam, her identical twin daughters and son. they go to a quaint little town. Set during and after Season 1 of Once Upon a Time, Charmed and H20. Cleo is a major character- Roland and Regina to
Crossover - H2O: Just Add Water & Once Upon a Time - Rated: K+ - English - Sci-Fi/Hurt/Comfort - Chapters: 6 - Words: 10,160 - Favs: 2 - Follows: 1 - Published: 7/19/2016
Merman or Werewolf by XxMadxXxHatterxX reviews
My OC Alex is a full mermaid who lives in the sea with her people with her one true friend Tate. She decides to live with her mundane mother for a while though. She ends up going to Forks and everything is just utter chaos. Rated T just in case.
Crossover - Twilight & H2O: Just Add Water - Rated: T - English - Romance/Drama - Chapters: 9 - Words: 9,890 - Reviews: 25 - Favs: 20 - Follows: 19 - Updated: 7/13/2016 - Published: 12/7/2014
0 Sabrina the Teenage Witch: Meets The H20 mermaids by kyubi2020 reviews
Set after Graduation and soul mates. After marriage Sabina and Harvey moved back into the aunts' old Victorian house with Sabina staring her new teaching job at her old high school, with Harvey starting his job at the office, but life is about to change as the arrival of Cleo, Rikki and Bella soon beings events to an head, which could affect both the mortal and magic realms.
Crossover - Sabrina the Teenage Witch & H2O: Just Add Water - Rated: T - English - Adventure/Romance - Chapters: 1 - Words: 5,826 - Reviews: 1 - Favs: 1 - Follows: 1 - Published: 7/10/2016 - OC - Complete
Welcome to Mystic Falls by The Star Thief reviews
Due to her parents business trip Emma is force to stay with her cousins Elena and Jeremy in Mystic Falls. You would think that a mermaid would not be shock to that find vampires, witches, and werewolves also exists. *edited version, originally publish 2013*
Crossover - H2O: Just Add Water & Vampire Diaries - Rated: T - English - Chapters: 6 - Words: 5,669 - Reviews: 8 - Favs: 19 - Follows: 19 - Updated: 7/8/2016 - Published: 6/2/2015
Piper's Tail by CHBNewRomeHogwartsBerk reviews
What if Piper had a tail during the Seven's Quest? What happens if the rest of the Seven find out? First Fanfic, please read and review! Takes place during The Mark Of Athena.
Crossover - Percy Jackson and the Olympians & H2O: Just Add Water - Rated: K - English - Chapters: 17 - Words: 22,488 - Reviews: 82 - Favs: 20 - Follows: 35 - Updated: 6/25/2016 - Published: 2/19/2015
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