What if Castle was an S.H.I.E.L.D Agent? He had retired long ago after the death of his wife. Now his daughter is fighting for her life and S.H.I.E.L.D must come in. How will the others handle someone that is completely different with S.H.I.E.L.D then he is with them? Will Kate's and Castle's relationship survive one more crisis?

AoS/Castle crossover! Skye is the daughter of none other than THE Richard Castle. But, more importantly, she's also the daughter of an Asgardian mother. What happens when Coulson's first protege-Special Agent Brynna Harmon-reunites her half-brother with his long-lost daughter? Spoilers for "Yes Men"

Hunt comes back to his safe house to find an old friend waiting for him. Hunt doesn't plan on joining SHIELD, but he does wonder if Coulson can offer some help to his son. A few days later, Beckett gets a call from May, who has some crucial info on Rick's disappearance, and also some words on Beckett's old Washington DC job.

As S.H.I.E.L.D. falls, so does the 12th Precinct.

The new SHIELD is being rebuilt while new missions come up followed by old agents. AU: Grant Ward had another elder brother who had been taken by child services. What happens when the elder brother turns out to be an Agent on an 18 year long mission? Castle and SHIELD mixup. Caskett FitzSimmons SkyeWard

Skye finds out who her mother and father really are. What will her Dad think of her? She thinks he thinks she is dead. Is that true or not? Hermione was adopted too. Who is HER family? How will they get along? What about her new siblings and step-siblings? How will the family reconnect? Castle/Harry Potter/S.H.I.E.L.D crossover

Someone has been guiding and supporting Agent Phil Coulson since the day of his resurrection. But when Coulson turns to this source of support to save Skye, he learns more about Skye (and himself) than he ever could have imagined. In my "Four Winds" alternate universe ("Castle"). Sequel (in spirit) to my Castle/Avengers X-over "North Star".

Set after Kate quit the force and goes to Castle. Castle tells her he is part of S.H.I.E.L.D. He explains all about it. That makes Kate join S.H.I.E.L.D with Castle coming out of retirement for her. 5 years later they come to a case with the NYPD. How will her old friends handle the new Kate Beckett?...

The Chitauri Virus strikes New York, inadvertantly reuniting Richard Castle with his long-lost daughter. Agents of SHIELD/Castle crossover. Please read and review!