A/N:

Winter Soldier AU! I tried to not copy a lot from the original and I'm really sorry if it looks too much like the original. I really did try to make this an AU but still leave enough detail to make this into my own story.

I made up the machine and the serum. The serum is for wiping out memories and making it easier to install commands to a person and the machine is for injecting the serum 'cause it would be so weird if a serum like that could just be injected through a syringe.

The Omega War is also something I made up and if something really does exist then I don't intend to start making relations. Just imagine this big, world-changing war and that's it.

I hope you enjoy!

SO COLD

My breathing hitches when I see her. The same twin blue storms still rage behind those eyes but not quite so. Today, they were silent yet still unable to hide the emotions within; the want to subdue, the lust for killing, the need to accomplish whatever disgusting mission they programmed in her. The Diana before all this had a fiery spirit and a headstrong soul; jumping into action and thinking of a plan along the way, not caring about anything but saving everyone. But now, she was calculative. Careful yet deadly; a trained murderer. An assassin. She is the Winter Soldier.

"You're alive.", I whisper to her as a question, to myself as a conviction. I knew she wasn't going to answer. I grip the halfmask harder, the same halfmask I snatched away moments ago, the halfmask which concealed the Winter Soldier's identity and her perfect face from me for four years. "How?", I ask again, knowing it would be fruitless but still hoping.

I feel her move. Her foot moved a little, but I was still able to catch the subtle movement. The wind blew up on the rooftop I had trapped her, covering her regal features with her unbound messy dark locks. I was so captivated at how much I missed gazing at her raven hair and longed to run my fingers through them again that I almost didn't catch her snatch a gun from her holster and fire at me.

I rolled away, my black cape swiftly trailing behind me. My reflexes drew a batarang from my utility belt and I could feel the familiar push and pull of my muscles as I threw the weapon in retaliation. She extended her arm and blocked the batarang with her gauntlet, the armband glistening under the sun as the batarang ricocheted off it.

Diana moved to the edge of the rooftop but it didn't surprise me because I knew, even without her powers, she would do anything to escape... including jumping off a 50-floor building. But I had to ask her something before she disappears again.

"Diana,", I call and my heart tightens at how she abruptly paused when I did. "Do you know who you are?"

She looks back a little, showing me the dangerous blue gleam in her eyes, showing me the eyes of the Winter Soldier, and then she jumps off the building. I ran to the side, gripping the edge where she stood moments ago, and I almost fell as I looked for her below. But there was no trace of her, like snow after winter.

I search the rooftop for something, anything, she might have left behind, crumbs of clues and marks or traces, and then I see it, my hope, my light in the dark. There was her red star earring on the edge of the rooftop.

Watchtower

"What happened out there, Batman?", Superman bombards me with questions regarding my encounter with the Winter Soldier in Gotham City. The Winter Soldier was our top priority after he, or she (the others still didn't know the person behind the mask was our lost princess) assassinated the lead scientist of the Project Youth roster and then destroyed the lab and all progress they made for the succession of the project. Project Youth was about formulating a serum that could inject metahuman abilities to regular soldiers so they could contribute a larger effort in protecting the country against extraterrestrial intruders, seeing as how useless the Force has become in every battle against aliens and magical monsters. And there will come a day when the Justice League would be too short of members to defend the entire world. Thus, welcome, Project Youth.

But, now, all those theories of formulating that special serum has burned to ashes thanks to the Winter Soldier who came out of the blue one day.

Normally, I wouldn't share about my recent exploits in Gotham with the League but I thought they would like to hear of this so here we all are now except for the one who we all thought had died in action four years ago. Except for me. I always knew she was alive, I just didn't know where.

"I know who the Winter Soldier is.", I say.

Shayera slams her fist on the table. "Who's the bitch?", she growls. Our first encounter with the Winter Soldier, where three of the Original 7 were present, had left her pride so severely wounded. She is still sporting the cast on the arm Diana twisted, and she wants nothing more than to return the favor. I secretly wonder if she would still like to return the favor once she finds out who her nemesis really is.

I look straight in her green pools and simply answer, "Diana."

Her eyes widen and she seems to have stopped breathing when she falls to her chair, her mouth slightly opening. John reacts differently. "Diana died in the Omega War.", and then he hesitantly adds. "She died saving you."

My mind almost escapes back to the moment I suddenly see her body in front of me, being engulfed in red light, but I held it tight. I didn't want to recall those days. Not now that I have yet to bring her back.

I was about to tell them of the encounter on the rooftop when Clark suddenly has his hands fisted on the collar of my suit. His eyes were almost red as he lifts me off the ground simultaneously holding back tears. "Why didn't you bring her back?", he asks in a strained voice, each word ending with a painful edge. I knew that if he were someone else and not the mild-mannered farmboy that was Clark Kent, he would have blown my head off already.

"I couldn't.", I say, trying to hide the defeated tone that suddenly laces my voice. "She doesn't remember anything."

"Then that means Diana killed all those people and destroyed the lab.", Wally says and it felt weird having to hear a morose version of his voice rather than the usual chipper tone. "Who did this to her?", he asks almost angrily.

"We have to find Diana.", J'onn states with finality. He was so quiet at the end of the table that I could see the others jump when he suddenly spoke, but I knew that this revelation affected J'onn as much as it did to me, maybe even more. If there was one person in the League that an outcast alien without any knowledge about the world he would protect could go to, then it was another outcast foreigner facing similar problems and a mind as wise as his.

"How do we do that?", John speaks. "The Winter Soldier is like a shadow. Once she's done, she instantly disappears."

I palm the red earring I have been holding ever since I picked it up. "I have a clue."

I allow my gauntlet to open, revealing the shiny bloodred star in the middle of my hand and it almost leaves Shayera to tears. "Diana...", she breathlessly whispers.

"Before she left, I asked her if she still knew who she was.", my eyes look at the red star that was almost smiling at me. "She left me this."

"So she remembers who she is and she's trying to give you a signal.", Clark says with a hint of hope in his voice.

"Or maybe it was with her when she became the Winter Soldier and she doesn't know what that's about so she left it and decided to leave everything about her past life with it too.", Wally suggests.

We all glare at him but Shayera's the one who threw her mace at him and almost hits Wally. "You're supposed to be the optimistic one, Wally."

J'onn turns back all the attention to me. "So you can find her."

I go through all of them, my eyes looking deeply into each of theirs and I can see how much responsibility they have given me. They were so broken and defeated when they found out Diana had died without leaving even a piece of her uniform to bury her memory with, and they're broken once again when they found out Diana was alive but with no memories and being tortured into killing people. Each of them needed Diana to return. The lost princess means something to them.

And I am the one they asked to bring her back; the one who needed Diana the most.

"I will."

Someone Else's POV

My fingers gently touch the wound on her arm, the one I just cleaned. Without most of her metapowers, a wound that normally could have taken ten minutes to heal with her superhuman healing was now closing in a very slow pace that the wound was still there when she returned to me. "How are you?"

Her voice comes out clear and as strong as ever. "Fine."

I look at the bandaged wound again. The Batman actually hit her. He was a problem I'd have to take care of soon. I was watching from the camera hidden in her earring so I saw the moment the batarang hit her on the arm while they were still chasing each other from roof to roof. The wound was probably nothing for her but I wanted her to be in perfect condition always. She is my best success by far.

The virtuous Wonder Woman, with a bottle of my serum, was turned into the assassin I needed. Unfortunately, the serum also negated her ability to fly and weakened her skill to heal but she still has her metahuman strength, and combined with the years, centuries, of training different fighting styles aside from the Greek styles she has already mastered... perfect!

I look at my masterpiece again as she stands in front of me. She was clad in a black suit that covered her from her toes to her neck. She still had her gauntlets, something I would never waste on throwing away, but her lasso was stored somewhere else. It was a dangerous weapon. If she touches it even once, then the illusion is over and the serum would stop taking effect. The truth will be revealed.

I tell her to turn to the side and she does, revealing what I love most about her ensemble; the bloodred star glowing darkly on the sleeve of her right arm. I do realize that the star was also her symbol, but this one was in a deeper shade of red. A red you can only see when you spill someone else's blood.

We go inside an adjacent room where scientists are scurrying around and preparing the machine I created that would inject more of the serum inside her. I lead her inside it but she flinches a little at the sight of it and this greatly alarms me. This has never happened before. Has she gained consciousness of what the machine could do to her?

She goes in anyway. When the locks click into place, I order the scientist operating the machine to double the serum used. That little flinch still alarms me.

The machine glows blue in the dimly lit room and a moment later, I hear it; a sound I do not wish to hear but a sound telling me that I have succeeded once again. The machine worked and her screams fill the room. Her screams of pain as more of the formula enters her body are banners of my success. Each dosage of my serum have made the mighty Wonder Woman my assassin. She writhes inside the machine and she struggles against the binds but while inside the machine, her powers are gone.

I smile a little. "Don't worry, Agent Diana Prince. The pain will end soon.", but I know it would last a little longer than usual because of the additional serum. "And when it does, I already have your next mission..."

"...end the Batman."

A/N:

This idea has been bothering me for days and it feels real great to write it out. The feeling when you complete something is amazing.

And, yes, I'm a sicko. Why'd I do that to Diana and not Bruce? 'Cause I believe the world would end if Bruce becomes a brainwashed soldier assassin. And besides, he probably has a contigency plan for this sorta thing. And if he doesn't, then Alfred probably does. And besides, the story would be over in a second as soon as Diana catches Bruce in her lasso. I believe the lasso has the power to negate brainwashing.

But the idea of Diana trying to not-brainwash Bruce is not rejected.

If you like it, I could continue this. I only meant for this to be a scene where Bruce sees Diana as the Winter Soldier and then the Watchtower scene was added and before I knew it, I also put in that sick last scene and then I have all these scenarios in my head that could just continue this story but my problem is which of these should I use?

So before the AN becomes longer than the story, I'm ending it here. Thank you!