The Guardians, the Avengers, and a 'few' of their friends and allies go to war against HYDRA and end up scouring the far reaches of the galaxy to protect the six Infinity Stones. AU to Avengers 2 and Season 2 of Agents of SHIELD.

In the aftermath of The Snap, Rick Castle starts to rebuild his life. Fortunately, he has Hope. Spoilers for Avengers: Endgame.

Someone has been kidnapping women on the island of Manhattan - women with something special in common - and their friends and family team up to find them. Friends and family who happen to be members of the Avengers, the NYPD, and one novelist with an overactive imagination. This crossover includes characters from not only Castle and The Avengers, but also the TV show The Unusuals.

Castle has been searching for Clint ever since the whole Avengers and Alien incident in New York the year before. Clint is sent to tell Castle to back off, but that's not his only mission in the city. (Sequel to Nighthawks).

The first meeting of Alexis Castle and Phil Coulson. Prequel to A Stair of Swords.

In the "Four Winds" universe (My Castle Fantasy AU series). An unknown mastermind seems to be trying to give the world's criminals supernatural abilities. Can the Guardians and the Avengers work together to find and stop this evil before it plunges the world into chaos? SPOILER ALERT: STORY WILL INCLUDE SPOILERS FOR "IRON MAN 3"

A man wandering alone in New York finds his way into a coffee shop, where he meets a girl who tells him they're friends. In spite of his questions, he lets her care for him until someone tries to kill both of them. Who is he? And why does someone want him dead? T Rating to be safe.

Rick Castle is looking forward to a relaxing evening with Beckett. Unfortunately, his brother didn't get the memo.

La journée était pourtant si calme...

Sequel to 'Lies My Partner Told Me'. Richard Castle aka Dr. Hank Pym and Kate Beckett deal with the aftermath of Castle joining the Avengers and Beckett getting blasted by the Tesseract. Alexis cleans up the city while Steve 'Captain America' Rogers relearns his new home. Ryan and Esposito are drafted into a new squad. And Tony and Pepper search for the truth about Coulson.

Beckett has always wondered what Castle was like before they met. A visit by Nick Fury reveals he has a past she never could imagined and draws the two into the battle against Loki. Spoilers for 'Always' and a retelling of the CASTLE. I own nothing.

In which Castle follows a SHIELD Agent, Coulson is awesome, and Fury has a headache.