Supernatural and Castle Crossovers
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Unnatural Murder by nekoninja123
The McClaren Mansion is one of the most well known haunted spots in New York. All the evidence points to the deaths being supernatural, but Beckett never believed that... until now.
Rated: T - English - Horror/Tragedy - Chapters: 1 - Words: 7,671 - Follows: 2 - Published: 4/24
The Usual Suspects by Lady Lini reviews
When two John Does are caught in the middle of a grave desecration, it's up to New York's four finest detectives to figure out who they are and what they were doing. (Destiel, Caskett) (T for language)
Rated: T - English - Humor - Chapters: 1 - Words: 3,610 - Reviews: 1 - Favs: 2 - Follows: 2 - Published: 4/6 - [Dean W., Castiel] [Rick C., Kate B.] - Complete
Serial Killings That Aren't by Writing Fangirl for hire reviews
Castle and Beckett are investigating what appear to be a series of strange unnatural serial killings. Dean and Cas are investigating the same killings, but they know what's going on. Will the police and the hunter and angel be able to work together to crack this case?
Rated: T - English - Humor/Romance - Chapters: 7 - Words: 7,091 - Reviews: 9 - Favs: 8 - Follows: 17 - Updated: 2/26 - Published: 6/26/2014
Biting the Big Apple by DragonKnight159 reviews
What should have been a relaxing day for Castle and Beckett turns into a much bigger crime than they could have imagined when two "FBI" agents show up for an unusual crime. Set Castle Season 5 and Supernatural Season 8. Contains Caskett.
Rated: T - English - Crime/Supernatural - Chapters: 8 - Words: 15,206 - Reviews: 21 - Favs: 36 - Follows: 68 - Updated: 10/7/2014 - Published: 2/23/2013 - [Rick C., Kate B.] Sam W., Dean W. - Complete
The Stuff of Nightmares by Imbrus-the-Wolf reviews
Detective Kate Beckett has always been a skeptic. She's never believed in ghosts, or anything paranormal. But when she and her open-minded partner Richard Castle stumble into the world of the Winchester brothers and their friend Castiel, who hunt creatures of that persuasion for a living, she is forced to re-evaluate everything she believes, and catch a new kind of killer!
Rated: T - English - Adventure - Chapters: 3 - Words: 3,320 - Reviews: 8 - Favs: 9 - Follows: 23 - Updated: 8/8/2014 - Published: 7/18/2014 - Sam W., Dean W., Rick C., Kate B.
Not Your Average Case by bandnerd21 reviews
There's something unusual about Detective Beckett that draws Castle to want to figure her out. But what is there to figure out? And who are those FBI agents who obviously aren't FBI? T to be safe, eventual Caskett, not sure how much Winchester there'll be, but we shall see.
Rated: T - English - Mystery/Supernatural - Chapters: 4 - Words: 3,355 - Reviews: 6 - Favs: 6 - Follows: 16 - Updated: 1/24/2014 - Published: 9/5/2013 - Dean W., Sam W., Rick C., Kate B.
Worlds Collide (SPNCastle) by castiel-in-a-sherlocked-tardis reviews
Castiel finds out that Kate Beckett and Richard Castle are weapons used by the angels. The demons want them dead, and the angels want to keep them safe, but none have actually tried. Kate, Castle, and Castiel soon find out that the angels have sided with the demons, and Dean, Sam, Castiel, Castle, and Kate have to team up, not only to save their lives, but to save the world.
Rated: T - English - Supernatural/Romance - Chapters: 1 - Words: 248 - Reviews: 1 - Favs: 3 - Follows: 3 - Published: 10/26/2013
The Ghost On the Shore by agrove reviews
With fishing poles in hand, waiting for brothers and best friends, two figures sit on soft earth under a massive oak enjoying each other's company. One-shot.
Rated: T - English - Spiritual/Hurt/Comfort - Chapters: 1 - Words: 1,706 - Reviews: 11 - Favs: 9 - Follows: 4 - Published: 6/10/2013 - Dean W., Sam W., Kevin R., Javier E. - Complete
Charlie Don't Need No Angels by KateandRickplusSamandAndyLover
AU Dean meets a woman in a bar while on break from cases, finding an emotional connection he hasn't had since Lisa. Dean and Sam are in New York to visit his long lost cousin, Detective Kate Beckett. They end up working together on an impromptu case. Caskett/Dean-Charlie. Charlie is NOT the lesbian/computer hacker from Season 7. Rated T for now.
Rated: T - English - Romance/Supernatural - Chapters: 1 - Words: 204 - Follows: 3 - Published: 10/17/2012 - [Dean W., OC] [Kate B., Rick C.]
Fools Rush In by The Black Sluggard reviews
When Javier Esposito went missing and the body of an unidentified woman was found in his apartment, Detective Kevin Ryan refused to believe the worst of his partner. Now, with the case threatening to go cold, he has embarked on his own investigation, determined to uncover the truth. Crossover with Supernatural. Slash, Ryan/Esposito.
Rated: T - English - Mystery/Supernatural - Chapters: 5 - Words: 11,246 - Reviews: 6 - Favs: 14 - Follows: 7 - Published: 7/7/2012 - [Kevin R., Javier E.] Bobby S., Claire N. - Complete
The Road So Far by Kathryn Brennan reviews
When Kate Beckett disappears from New York, how far will Castle go to find the truth?
Rated: T - English - Angst/Supernatural - Chapters: 2 - Words: 2,133 - Reviews: 9 - Favs: 7 - Follows: 25 - Updated: 3/7/2012 - Published: 3/5/2012 - Dean W., Kate B.
Destructive Criticism by SweetChi reviews
Castle faces off with Chuck after the latest Supernatural book upsets Alexis.
Rated: T - English - Chapters: 1 - Words: 2,466 - Reviews: 32 - Favs: 96 - Follows: 15 - Published: 12/8/2011 - Chuck, Rick C. - Complete
A Bounty on a Hunter by Sameuspegasus reviews
How can a dead woman kill her husband? And why is his body lying on a picture of Dean Winchester? Set Season 5 of SPN, between Swap Meat and The Song remains the same. No specific time for Castle prior to end of S3 .
Rated: T - English - Mystery/Supernatural - Chapters: 11 - Words: 28,796 - Reviews: 122 - Favs: 138 - Follows: 65 - Updated: 12/3/2011 - Published: 9/13/2011 - Complete