39 Clues Crossovers
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The Great Battle by TrueTeal reviews
This is an adventure like no other for Percy and the 7. They meet a lot of new people, and demigods at that! This is an Epic adventure for them all! It is several small quests/adventures leading up to the Big War. Kronos and Gaea are back, WITH ALLIES, INCLUDING THE ONE, OPAL KOBOI, AND SCORPIA, WHICH IT'S HIGH RANKING OFFICERS INCLUDE THE VESPERS, PLUS ISABEL KABRA, WHO OWNS ITEX!
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K - English - Chapters: 49 - Words: 37,140 - Reviews: 43 - Favs: 1 - Follows: 4 - Updated: 12h - Published: 1/16
The Doctor's Many Companions by 1bluesapphire reviews
When Sapphire Stone(my OC) finishes her story "Allies in the Oddest Places" the last things she expects is to meet many characters from the 39 Clues, a friend from FanFiction, and the 10th Doctor. But she does meet them, and many other people. However, one question is always on her mind: Who is Irina Campbell really, whose full name is a mystery on its own? Rating may go up.
Crossover - Doctor Who & 39 Clues - Rated: T - English - Adventure/Mystery - Chapters: 16 - Words: 24,884 - Reviews: 16 - Favs: 4 - Follows: 3 - Updated: 8/7 - Published: 3/25 - 10th Doctor, Alistair O., Irina S., OC
All That We See or Seem Is But a Dream Within a Dream by SelfiesWithSprinkles reviews
Ian Kabra and Dr. Ian Malcolm had never heard of each other before. In one of the Cahills' only times of peace, it is decided that the newest Cahill leader, Ian, must learn one of the world's best-kept secrets- that dinosaurs roam Isla Sorna. Ian and Malcolm's awkward meeting turns into something neither would have thought of before. . . . A friendship?
Crossover - 39 Clues & Jurassic Park - Rated: K+ - English - Parody/Humor - Chapters: 1 - Words: 1,888 - Reviews: 1 - Favs: 1 - Published: 7/27 - Complete
Percy Jackson and Amy Cahill by Percy39games reviews
Amy isn't a demigod and Percy isn't a Cahill,but can Amy see through the mist?
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K+ - English - Adventure/Romance - Chapters: 1 - Words: 39 - Reviews: 1 - Follows: 1 - Published: 6/28 - [Percy J., Amy C.] [Annabeth C., Jake R.]
Reading Percy Cahill: PJO by imjustanotherPJOandHoOfangirl reviews
Percy Cahill Jackson. That's right Cahill. Percy's Amy & Dan's adopted half-brother (on his mom's side of course). But they (and other Cahills) are taken to a room to read the PJO series. How will everybody react? Note: I do not own anything but the plot & the twist.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K+ - English - Humor/Friendship - Chapters: 2 - Words: 502 - Reviews: 5 - Favs: 1 - Follows: 3 - Updated: 6/24 - Published: 6/15
Black Stash by TimeLady31415
The Black Stash, a weapon so powerful it could destroy the universe, was left with the Madrigals. Now, Red Skull wants it. One girl was given the secrets to find it, and Red Skull has her. Worse, she's the Avengers' adopted daughter.
Crossover - 39 Clues & Avengers - Rated: K+ - English - Adventure/Suspense - Chapters: 1 - Words: 415 - Published: 6/23
Timeless by Prodigy411
When Gideon developed the Infinity Ring, the SQ had kept an eye. But now, the worlds crossed, so can they fix this?
Crossover - 39 Clues & Infinity Ring series - Rated: T - English - Chapters: 1 - Words: 270 - Published: 4/22
The Collision of the Two Worlds by NRK reviews
What happens when the two different worlds surprisingly collide. Alliances and friendships are formed or will hatred ensure the fall of both worlds while fate runs it's course.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K - English - Friendship/Hurt/Comfort - Chapters: 13 - Words: 12,996 - Reviews: 15 - Favs: 6 - Follows: 13 - Updated: 4/17 - Published: 6/26/2014 - [Annabeth C., Percy J.] [Amy C., Ian K.]
Olympus Stand: The Lock of Gideon by Prodigy411 reviews
When the Cahills and demigods learn their a bit of both, they must work together to stop Diachronikó Vesper, Damien Vesper III's long lost brother, descendant of Kronos, from opening the ate behind the Gideon Lock. Can the demigods and Cahills stop Diachronikó, or will all be lost? First in the Olympus Stand series.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: T - English - Adventure - Chapters: 4 - Words: 1,460 - Reviews: 9 - Favs: 2 - Follows: 1 - Updated: 3/8 - Published: 3/7
The Secrets We Keep by craycray3 reviews
Hi this is my first fan fiction, please don't be too hash in reviews... its a cross over between 39 Clues and legend of korra. Please give it a chance, is much better than it sounds, just didn't want to give it away. And also, everything is explained so you don't have to of actually seen any legend of korra. anyway… so here goes The Secrets We Keep!
Crossover - 39 Clues & Legend of Korra - Rated: T - English - Drama/Supernatural - Chapters: 5 - Words: 2,354 - Reviews: 1 - Updated: 3/5 - Published: 2/23 - Amy C., Dan C., Ian K., Korra
A Mixed-up Reunion by Snowflake Eliza Cahill Sparkle reviews
This is my first fanfiction. This is actually a crossover of 39 Clues, Kane Chronicles, Percy Jackson and some others. Oh, well. The title explains it all. It starts with 39 clues though. Sorry, I suck at summeries. There will be OCs. Lots of romance, pranks, music and truth or dare. This is before the Vespers but after the clue hunt. ABANDONED. I HAVE WRITER'S BLOCK. SORRY.
Crossover - 39 Clues & Kane Chronicles - Rated: K+ - English - Romance/Fantasy - Chapters: 3 - Words: 7,764 - Reviews: 2 - Favs: 2 - Follows: 3 - Updated: 2/9 - Published: 1/14 - Amy C., Dan C., Carter K., Sadie K.
Who Wants the Medusa? by QuayJaquelinXeomaraZendaya reviews
This is my first fan fic- no flames please. Follows The Medusa Plot, but has some changes. Future AmyxJason.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K+ - English - Adventure/Friendship - Chapters: 38 - Words: 56,259 - Reviews: 244 - Favs: 88 - Follows: 92 - Updated: 2/8 - Published: 11/12/2011 - Percy J., Amy C. - Complete
A Sea Monster Ride in the Atlantic by QuayJaquelinXeomaraZendaya reviews
Third to "A Pegasus Ride" and "A Dog Ride" one-shots. In this one-shot, Dan (with guest star Saladin!) come across a very interesting new beast. Warning: lots of random references, horrible taunts, and bad plans. Wait, how come only Percy and Nico get a ride?
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K - English - Humor - Chapters: 1 - Words: 1,378 - Reviews: 3 - Favs: 1 - Published: 12/31/2014
A 39 Clues Christmas Carol by 1bluesapphire reviews
Ho Ho Ho! Merry Christmas! To get you all in the Christmas mood, I'm writing a modern 39 Clues version of one of the best well-known Christmas stories around: A Christmas Carol. It will include Christmas songs and other short stories from over the years. Hope you enjoy it, and have a Merry Christmas. Nikolai and his father are alive in this one, never fear.
Crossover - 39 Clues & A Christmas Carol - Rated: T - English - Drama/Adventure - Chapters: 9 - Words: 6,300 - Reviews: 8 - Favs: 1 - Updated: 12/29/2014 - Published: 12/6/2014 - Isabel K., Irina S. - Complete
Cahills, Meet Equestria by PinkiePieFanatic reviews
What happens when one extraordinary group of friends meets one extraordinary family? Read to find out. I barely own anything!
Crossover - My Little Pony & 39 Clues - Rated: K+ - English - Humor/Adventure - Chapters: 3 - Words: 536 - Reviews: 3 - Updated: 12/13/2014 - Published: 12/10/2014
The Gallagher Clues by KookieLuver reviews
The Interpol ask for help from none other than the Gallagher Girls to help catch a couple of criminal kids... Dan and Amy Cahill. This is a crossover of The Gallagher Girls just after "I'd tell you I love you, but then I'd have to kill you", and an almost completely changed "In Too Deep". I do not own these series. My first FanFic. R&R. I'd appreciate it... Enjoy! :)
Crossover - 39 Clues & Gallagher Girls - Rated: K+ - English - Mystery/Adventure - Chapters: 5 - Words: 2,686 - Reviews: 15 - Favs: 7 - Follows: 14 - Updated: 10/25/2014 - Published: 4/30/2013 - Amy C., Dan C., Cammie M., Bex B.
School of Chaos by luciangirl06 reviews
Amy goes back to school. What will happen when she meets her sneaky relatives? What will happen once she meets Annabeth and Percy? A powerful demigod is sure to attract monsters. Takes place after TLO and Into the Gauntlet. Notice: This fan fiction is undergoing major renovations. New readers are welcome to read. For the old ones, please re-read.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: K+ - English - Chapters: 3 - Words: 3,968 - Reviews: 207 - Favs: 80 - Follows: 104 - Updated: 10/21/2014 - Published: 10/23/2010 - [Annabeth C., Percy J.] [Amy C., Ian K.]
39 Equestrian Clues (Amy&Dan) by Fictional Writer of Greatness reviews
Read Discontined for incorrect chapter count!
Crossover - My Little Pony & 39 Clues - Rated: K+ - English - Chapters: 2 - Words: 292 - Reviews: 1 - Updated: 10/10/2014 - Published: 9/24/2014 - Twilight Sparkle, Amy C., Dan C.
ian jackson and the olympians by Krystal Cahill-2014 reviews
This is my first story so plz read. the cahills go on a reunion and read the percy Jackson and the Olympians the lightning theif.
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: T - English - Chapters: 3 - Words: 6,664 - Reviews: 9 - Favs: 3 - Follows: 3 - Updated: 9/14/2014 - Published: 6/21/2014 - Amy C., Ian K., Jonah W., OC
Two Types of Men in Suits by Thorn D. Cinni reviews
We were going to live in Japan for a year, hoping for some peace before the Vespers arrived, but... let's just say we don't always get what we want. And I realized...the Cahills aren't the only influential people in the world.
Crossover - Katekyo Hitman Reborn! & 39 Clues - Rated: T - English - Humor - Chapters: 2 - Words: 2,003 - Reviews: 4 - Favs: 9 - Follows: 12 - Updated: 8/4/2014 - Published: 4/12/2014 - Reborn, Vongola 10th Generation, Amy C., Dan C.
Cahills and Mermaids by limegreen0421 reviews
The 39 clues hunters meet a girl named Emily Windsnap. But Emily isn't a regular everyday girl, she's a mermaid.
Crossover - 39 Clues & Emily Windsnap series - Rated: K+ - English - Adventure/Mystery - Chapters: 11 - Words: 4,190 - Reviews: 16 - Favs: 2 - Follows: 1 - Updated: 5/24/2014 - Published: 9/20/2012
dollar ian kabra by lubnacahill reviews
"natalieee"!where are my pants!clothes?"natalieeeeee"!
Crossover - Harry Potter & 39 Clues - Rated: K - English - Humor - Chapters: 1 - Words: 164 - Reviews: 3 - Follows: 1 - Published: 5/17/2014 - Complete
Silver Arrow by shiningwaves reviews
Master Bolt and Master Serum? Think about it. As Amy and Dan near closer to the only thing powerful enough to defeat the gods, Percy and Annabeth are sent to destroy all the clues in their wake. But as they reach the serum, they have orders to kill them. Yet sometimes in Life, you can't decifer whats wrong, and whats right.*rewritten* Origanally Impossible Quest NOT AmyxPercy
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: T - English - Family/Drama - Chapters: 3 - Words: 3,469 - Reviews: 34 - Favs: 15 - Follows: 27 - Updated: 5/9/2014 - Published: 6/20/2012 - Percy J., Amy C.
Percy Cahill :The Medusa's Plot by SalvatoreRoses reviews
Percy Jackson is actually Percy Cahill, He is Amy and Dan's half brother .Watch the three siblings as they struggle to complete Vesper 1's demands. Suspicion arises and secrets will be revealed. Percy is still a ad the A/N guys please READ AND tnx
Crossover - Percy Jackson and the Olympians & 39 Clues - Rated: T - English - Family/Adventure - Chapters: 2 - Words: 1,758 - Reviews: 23 - Favs: 25 - Follows: 31 - Updated: 5/4/2014 - Published: 9/15/2013 - Percy J., Amy C., Dan C.
The Bloody Git and the Pirating Wankers by Lapulta J.R.R. Cahill
In which Thomas learns four-lettered words, exactly how to infuriate a fairy, and that all nations are equal. (But some nations are more equal than others.) :: language warning
Crossover - 39 Clues & Hetalia - Axis Powers - Rated: T - English - Adventure/Drama - Chapters: 3 - Words: 22,847 - Favs: 1 - Follows: 2 - Updated: 3/5/2014 - Published: 2/28/2014 - Thomas C., England/Britain, Scotland
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