A/N: So I kind of want this to happen and well the idea came to me at 1am when I was unable to sleep so here it is.

My Castle/Firefly crossover.

After defeating the operative Mal was captured by the alliance and sent to Earth-that-was as punishment for spreading the truth about Miranda. There Malcolm Reynolds lives his life as a different person, Richard Castle. However, one-day Castle arrives at the precinct to find two people from his past. He's real past

Hope you enjoy!

Disclaimer: Sadly I do not own Castle or Firefly or any of the characters. Only the DVDs, which I watch continuously. I also do not own the ABC or FOX because if I owned FOX Firefly would still be running :D

'Hey Karpowski! Could you hold the elevator?' Castle called out as he jogged through the twelfth precinct's lobby. 'Thanks' he smiled to the detective as he stepped in.

'No worries Castle' she smiled at the writer 'man I wish I was a writer's muse, that way I'd get nice coffee' she laughed and he joined in. they spent the rest of the short trip in a comfortable silence. When the elevator stopped they got off and walked into a tense bullpen. Karpowski went her separate way and Castle could see Captain Gates was with Ryan and Esposito at Beckett's desk with a bulky guy and a tall slender woman next to him.

'Morning everyone, what's going on?" Castle asked as he approached the desk.

'Castle these people say you are…' Ryan stopped, unable to finish his sentence. The two strangers turned around and the sight Castle saw was enough to make all the colour drain from his face. What were they doing here? How in the 'verse di they find him?

'Well isn't that somethin' Cap?' The large man said to the lady 'bet you never thought we'd see his sorry face again after those purple bellies took him.'

Castle stood in disbelief as the tall lady stared back at him with a similar expression.

'What are you-' Castle couldn't finish so he just stood.

'It took us a while but we finally tracked you down Sir.' The lady spoke for the first time.

'Sir? Did she really just call Castle sir bro?' Esposito asked Ryan

"That's what I heard, don't know why though' Ryan replied

'Castle what the hell is going on? I got these two people saying you're some sort of captain of their spaceship' Gates looked on with doubt.

'Uhhh yeah, about that' Castle started 'I may have not been entirely honest about my –

'Hey Zoe why does he look so old compared to us?' Jayne interrupted

'Jayne shut up would you and let the Captain speak.' Zoe harshly said.

'How did you find me?' Castle asked in disbelief.

'Well, 'Nara did it' Jayne spoke again 'it took her a lot of clients but she got to the real high up purple bellies and found out from them using her "wiles".'

'Inara' a small smile played across Castle's features

'Look cap'n we don't have a lot of time so we best get going back to Serenity.' Zoe cut into Castle's thoughts

'Look Zoe I appreciate what you guys are doing but I have a life here of my own. I have a family, friends–'

'I thought we were your family Mal!' Jayne shouted

'Look Jayne I just need some time to process this and think all this through.' Castle replied calmly.

'Tomorrow,' Zoe looked him straight in the eyes, 'someone will be back tomorrow.' Zoe turned and started to walk towards the elevator with Jayne quickly following and then they were gone.

'My office… Now!' Gates said sternly and walked towards her office with Castle in tow.

She just stared at him in disbelief and she didn't look too happy about.

'Are you actually being serious?' She almost yelled at him.

Too scared to speak he just nodded like a dashboard dog on a bumpy road.

'You want me to believe that you are from the future where you Captain a spaceship' she said in a very tense voice, 'and you, you were sent to the past as punishment?' Gates gave Castle a very disapproving look. 'I think it might be best if you stick to your crime novels Mr. Castle.'

'Look I'm not lying!' Castle yelled back.

'What do you think bro?' Esposito asked Ryan as they looked on from their desks.

'I think that Castle is about to be in big trouble, and not just from Gates' Ryan replied, looking over to Beckett as he did. She just sat at her desk looking through the window to Castle. 'Hey Beckett!' Ryan called out, 'What do you make of this whole thing?'

She looked over at the two detectives. 'Would Castle really go this far to prank us?' she looked back into the office, 'But a space cowboy? I think it is pretty far fetched.'

Bang!

Castle stormed out of the office, slamming the door shut behind him.

'Un-Tā mā de-believable!' Castle grabbed his coat on Beckett's desk and went to leave.

'Castle what is going on?' Beckett asked as she followed him

'Well your boss doesn't believe me, I just got kicked out and, oh yeah! I have people from my past trying to take me back to the future whilst I try and get all you guys to believe me. Anything else you want to gorramn know?' Castle snapped at her and the boys. 'I'm sorry, I'm just a little confused right now.'

'How about we all go to lunch?' Beckett suggested with a weak smile

'I'll get the shakes! Esposito you don't have plans do you?' Ryan piped up

'Nah bro, I'm all good. So… Space cowboy huh Castle?' Esposito laughed as he grabbed his coat, 'Don't tell me you wore tight pants bro!'

Translations:

Tā mā de – Fucking

Gorramn – God Damn (Firefly fans should know this but just incase + for the Castle ones)

So this is the first chapter… Tell me what you think!

If you want me to continue, the next chapter will be very Castle show orientated so, the gang and their feelings on the news and maybe a little bit of Firefly at the end. However, I won't continue if no one is wanting to read so please let me know if you want me to continue and give me some ideas as I would love to incorporate them into the story

Leah