Hey guys, this is a story that I've posted on Wattpad and decided to post it here too so…. Enjoy? J

Prologue (Loki's POV)

"Amber Jade Foster" Fury announces.

A confidential folder was slammed down in the middle of the table and slid across in front of Tony. Tony dropped his legs from the table and took the folder. We all looked questionably at Fury who had a serious face like always.

"Who is she?" Natasha asked, watching Tony flip through the folder. Fury pointed to a girl behind him and she stepped out, revealing herself as Jane Foster.

"Jane?" Thor sits up in surprise.

"Thor" she nods at him.

"Hey big guy" Came another voice from behind Fury and Jane rolls her eyes.

"Darcy!" Thor says in surprise.

"Save you talks for later, Jane has something to tell you, concerning that folder Tony has" Fury eyes Tony as Tony shuffles through all the documents. He gestures for Jane to talk.

"Okay well um. I have a sister. She is 5 years younger than me and her name is Amber. She was taken from us when she was 10 and we haven't seen her since until now"

"You have a sister? And you didn't bother to tell me?!" Darcy looked at Jane in disbelief. Fury gave Darcy a glare and she shut up.

"This is your sister?" Bruce asks as he picks up a picture from the pile Tony made. He holds it up and shows Jane. Jane nods sadly as Bruce passes the photo around. When everyone sees the picture, they look at it in shock. When the picture comes to me, I look at it closely.

She looked like Jane but younger. Her hair was a much darker brown than Jane's, she had dark eyes that almost look black and piercing. But one thing that was different was that she had dog ears.

I look to Jane. "Why does she have dog ears?"

Jane shrugs but Fury answered for me. "Because we believe she was taken by HYDRA and they used her as an experiment"

"And? Why are we being told this?" I ask, frowning.

"Because Loki, she is now a target of SHIELD. She has been spotted stealing our weapons from our base down in New York and has been killing our agents down there. We are expecting her to attack Stark Tower next for his technology. I need you all to put a stop to this. Take her up here for questioning" Fury tells everyone.

"But please, don't hurt her" Jane puts in.

"Don't worry Jane, we will get your sister back in one piece and alive" Tony says, giving a slight bow. We all roll our eyes and Fury dismisses us to Stark Tower.

"Jane, we will make sure we won't harm her, I promise" Thor gives her a kiss and I roll my eyes.

"Please Thor, save that for later when I am not in your presence"

"Sorry brother, come. Let us get Jane's sister" he puts his arm around my shoulders and leads me out of the door.

I shrug his arm off my shoulders and glare at him as he laughs and continues walking in the direction the Avengers took. We took one of the jets down from the Hellicarrier and Nat piloted the jet towards Stark Tower. Landing on the pad, we exited the jet and walked inside Tony's main room on the top floor.

"Anyone want a drink?" he asks, walking over to his bar where he pours himself a drink.

"I would, but I have a job to do" A voice said from the shadows, almost like a growl. We all turn in the direction of the voice and raised our weapons.

"Show yourself!" Hawkeye hisses towards the shadow. In one quick movement, all of our weapons were taken out of our hands and dropped to the floor in front of us.

"I would, but I have a job to do" the voice growled again. We all look at each other in disbelief as she had managed to take Mjolnir from Thor as well. No one could do that but only those worthy!

"Are you Amber?" The Captain asks, stepping forward a little towards the weapons.

"Yes, I am. Why would you want to know Captain" She growls out a little louder as she notices Steve step closer.

We all looked at each other with faces of uncertainty. Bruce goes to speak. "We have come to take you back to SHIELD for your crimes"

"Sorry to disappoint you but I am not going. You're wasting your time here" Though she is covered by a shadow, we can see her piercing black eyes glowing. To be honest, it even scared me.

"You can surrender now or we will have to take you down and drag you ourselves back to SHIELD" Black Widow warns.

I see her eyes narrow and she gives us a low growl, a warning. "How will you be able to take me down when you don't have any weapons?"

"Loki" Tony points to me. Her eyes shift to me and it's like she has just noticed me.

"And what will you do Frost Giant?" She snarls towards me. Everyone, including myself look shocked at how much information she knows about us. What else does she know?

I recover from my shock and teleport to the weapons, giving them back to the Avengers who arms themselves for a fight. Tony calls for his armour and we prepare our weapons.

"Is this supposed to intimidate me? Scare me?" She laughs, almost menacing.

"This is our warning, you either surrender or we will knock you out" Tony says through his armour.

"Fine" she steps out of the shadow and I think we all take a second to look at her. She looks different from the picture we saw at SHIELD. Her ears were like a wolf's ears and she was quite tall. She then also had a black bushy tail behind her that was as long as her legs. I believe if she was standing next to me, she would be just below my nose. Her dark brown hair is now black and when she growls at us, she has extremely sharp dog like fangs.

Tony is he first to speak after our silence. "You look way different compared to your sister"

At this, she frowns. "I have no sister"

We all look at each other once again. Thor then asks, "Do you not remember Jane?"

"I think you have the wrong person, I have no siblings. I am an only child" We all watch as her nails become slightly longer and sharper like her fangs. "Now as I said in the beginning, I have a job to do. Get out of my way"

"Sorry, we cannot allow that to happen ma'am" Steve is first to attack by throwing his shield at her and we watch as she grabs it and throws is back towards him with incredible speed and power.

"I told you, get out of my way" She almost barks at us.

"Avengers! Attack!" Tony orders. He then adds "Sorry for this Jane"

Thor throws his hammer at her but she grabs it and throws it back at him, the same way she did with the shield. Tony shoots energy beams and Clint fires arrows at her but she slices them all with her claws. Nat goes in for close combat but it was a big mistake. As soon as Nat goes for a punch, Amber grabs her fist and throws Nat into Steve and they both fly into the wall.

Bruce goes all Hulk but not even he is any match for her. It's like she is a super soldier like Steve but a much better version. It went on like this for a while until I finally gave up from watching them all fail. I look around to see a gun that was used for darts. Nat must have dropped it from being thrown around.

I run for the gun and aim it for her arm. When she doesn't see me, I pull the trigger. The dart flies by in speed but my eyes widen when her hand grabs the dart in the very last second. She looks at the dart then up to me. She gives me a smirk and throws the dart at the hulk who was about to launch at her.

The sleeping darts made by SHIELD were meant for creatures like the Hulk. We all watch as the Hulk transforms back to Bruce and knocked unconscious. Amber turns her attention to me and runs at me, her claws narrowly missing my face.

I teleport behind her and throw a punch but she turns around quickly and grabs my fist. She twists it behind my back and pushes me to the floor. I groan in pain as she pushes my arm further into my back.

I manage to teleport once again out of her grasp and duplicate myself around her. I gesture to Clint to shoot her with his arrow that is like the sleeping dart when she is distracted and he nods. My clones and I close in on her and she slashes each clone but is unsuccessful. When she is fully distracted by my clones, Clint releases his arrow and it hits her right shoulder.

She growls when she sees the arrow. She rips it out and throws it to the ground. She goes to launch at Clint and we all get scared, thinking that the tranquilliser didn't work. But then she falls to the ground and I release a breath I didn't know I was holding. I make my clones disappear and Thor walks up to Amber.

"And Jane said not to harm her" Tony laugh but then winces in pain. "She managed to knock Hulk out and injure all of us!"

"I believe HYDRA is behind all of this. She must have been their lab rat and now they are using her to steal weapons from the most guarded places" Steve said.

"It's like what they did to Bucky. They wiped her memory and replaced it with tasks for her to do" Nat inputs.

"So she's like a robot with commands in her brain?" Thor asks as he picks her up from the floor after checking she won't wake.

"Something like that. Steve, take Bruce and we can meet Fury back at base" Clint uses his earpiece to contact Fury and he nods and gestures us to leave.