Chapter Summary: This is a prompt from ravenx1988: "I think it would be interesting to see a face off either of Black Siren vs Supergirl or Supergirl helping take down Cayden James."

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4. Secret Weapon

Oliver, Diggle and Felicity looked at each other apprehensive. Curtis, Dinah and Renee had left the team a week ago and things were not easier for them. There was a team of Supervillains that succeeded in destroy a lot in the city. It wasn't going to take long for Cayden James to target them and try to end them directly once and for all.

- Let's hope she comes… - Felicity said as she looked around the Arrow bunker, not knowing what else to say.

- I still think it was too soon…

- Oliver, it wasn't! I told you, I feel guilty already for being the responsible for Cayden James on the loose terrifying the city, I had to do something… I called her!

- I just hope everything's ok on her Earth so she can help us… - Diggle said as he looked worried at Oliver.

Oliver looked at the wall, thoughtful. He wasn't so sure about this plan of them, but it might work. Supergirl herself told them if they needed any help, they could call her. Oliver liked to solve his problems by himself, but it was almost impossible for Diggle and him alone to go against Anatoly, his former Russian friend, the Vigilante, Black Siren, Cayden James… He heard Barry was arrested, accused of murder so his team had enough to deal with for now. He was sure Barry was innocent, and wanted nothing more than go to Central City to help, but he also had a lot on his plate now. Legends were traveling through time, there was no way he could ask them to be back and help him. Sara told him after the Nazi madness that her team had to deal with anachronisms and he think he understood what they were. So their last hope was her, the girl of steel. He thought she could have been dealing with problems on her Earth, and tried to convince Felicity they should take care of it somehow, but she insisted, so he decided to go along with it.

It did not take long for the familiar wormhole open in the middle of the bunker. Oliver looked at it; feeling nervous out of the sudden and he had no idea why he felt like that.

- Supergirl! It's so, so nice to see you! – Felicity told her as she hugged the blonde as soon as she stepped out of the breach.

- Hi Felicity! Hi guys!

Kara smiled briefly and looked worried at them all.

- You said there was an emergency…

- All of our greatest enemies decided to come together and form some sort of a big super villain team… - Felicity started but was interrupted by Oliver.

- I hate to be the one asking for help, because if we can't deal with stuff around our city, what kind of heroes are we? But things were never this ugly around here before, half the team left, it's just the three of us now…

- I'm in! Who are we up against? – Kara crossed her arms excitedly and took a few steps closer to Oliver.

Shock went through Oliver's face as he looked at Kara. She never even heard the whole thing; she accepted helping them right away. He felt touched by this. Kara was definitely a kind hearted ray of sunshine.

- Thank you, Kara – He smiled to her and Felicity looked at Diggle with a knowing look.

- I'm happy to help!

- Well… The group's leader is Cayden James, a skillful evil hacker that wants revenge on me for losing his son…

- What do you have to do with his son…?

- I killed him!

Kara looked surprised at Oliver, trying to disguise it. She was aware about Oliver's unusual ways of dealing with criminals in the past, and she couldn't feel like judging him because she didn't know him that much. Barry told him he had suffered in the past, had to kill to survive, changed and tried another way when he went out to save the city, but still didn't changed the fact that she didn't actually know him.

- Ok…

- There's Anatoly, a former friend I met when we were held in a ship by an evil lunatic that experimented on humans, trying to find a cure for his wife. Anatoly is Russian and from the Russian mob.

- Former friend?

- I kind of pissed him off by doing a deal with him and breaking it. I stopped him from doing something terrible with my city and he got really mad, and swore I would pay him back.

- Hum… - That was getting more and more interesting, Kara thought.

- There is Black Siren, Laurel Lance from Earth 2…

- Wait… You had someone in your team with that name… I remember Barry telling me this…

- Yes, she is the evil version of our deceased friend. Imagine the shock… - Felicity commented.

Kara looked even more worried at Oliver. How on Rao's name could he keep going after all of that? She could just imagine how hard it must have been, to see an evil clone of a beloved one. She remembered when she met Bizarro Supergirl. It was a lab creation, but it was still a clone of hers that wanted destruction. She wondered if this person could be reached, could be saved. She was a human being, full of emotions and maybe had a reason for turning evil. Kara remembered how she was able to reach her clone, someone created in a lab, and maybe she could do the same for this person? She could see the hurt in Oliver's eyes. She would at least try if she had the change, she thought.

- And there's vigilante, Dinah's ex that thinks that killing criminals is the solution to our problems…

- And now teamed up with criminals… It makes no sense – Diggle looked pissed at Oliver.

- At least we can throw it at his face… Not that I would do it actually to his face, unarmed and…

- Felicity!

- Sorry…

They gathered around the table and tried to create some plan. Since Kara accepted their cry for help, she would be their secret weapon, someone they are not expecting. The element of surprise could actually make all the difference this time.

- I'm just… So tired! – Oliver commented as Kara was by his side. Diggle and Felicity were looking over the computer, looking for a clue where Cayden and his team were. – We tried to take them down; I actually thought just the three of us was enough.

- I can imagine. Sometimes it can be overwhelming, all of this… But it's ok to ask for help from time to time. I did it when the Daxamites tried to invade my Earth.

- Daxamites? – Oliver looked confused at Kara.

- From the planet Daxam. Their planet was destroyed as well, just as mine, but mine exploded, so… The thing is their Queen tried to make my Earth a new Daxam. And even my cousin had to help. I love him; he is the only family I have, blood family… But I always try not to ask for his help, because I need to be able to take care of my city, my way and… Sometimes, I feel like I need him. Sometimes it's too much even for me.

- Even the most powerful woman in the world needs help sometimes, and asks for it… I get it – Oliver smiled at her and he thought about what she said.

He knew she was trying to make him feel not so bad about asking for her help, he knew she noticed he was not that ok with this plan, and that she was trying to be supportive. It meant a lot to him, that she cared.

- I found them! – Felicity yelled excitedly as she turned her chair around to look at Oliver and Kara.

- Look, Cisco sent us the ear protectors we asked… - Diggle said as he grabbed the box and took the small devices. He handled Oliver and Kara a pair each and put his pair on his ears.

- What is that for? – Kara looked at the thing on her hand – It looks like something Barry did once to help me with a screaming villain.

- We have one of those. Black Siren. Her scream can make our ears bleed…

- Oh, I see…

- Let's go! – Oliver said as he put his hood on and Kara followed him and Diggle.

Cayden James, Black Siren, Vigilante and Anatoly walked inside an old warehouse, through its corridors until they reached a huge door. It looked heavy and really hard to open and Black Siren smiled. This was no challenge for her because blow things up were her specialty. She prepared to scream her lungs out when an arrow passed by the side of her face, getting stuck on the door.

- STOP RIGHT NOW!

Oliver's voice echoed through the place and all four villains turned around. Oliver Queen stood before them, with his partner, Diggle. Cayden James smiled calmly at him.

- I am surprised to know your arrogance is that big, Mr. Queen. For you to think we can take all four of us down with only the help of your friend… It's another level of stupidity!

- Who told you we are alone? You would be surprised.

- I know your team abandoned you, so yes, you are indeed alone. You and Mr. Diggle. As you know, my colleagues have amazing abilities and I think is pretty hard bullets and arrows will stop them… There's nothing you can do to stop us, so please step aside and don't interrupt us before this becomes an unpleasant situation.

Oliver looked defiantly as a whoosh of air made Black Siren's hair all messy and Kara stopped right between Oliver and Black Siren.

- I've faced speedsters before, silly girl! Just ask the Flash – She smiled, ready to knock Kara out.

- The thing is… I'm not a speedster – Kara smiled back at Black Siren, blowing strong air towards her, making her back hit the wall.

Anatoly grabbed his gun, trying to shoot Kara while Oliver fought Vigilante hand on hand. Kara looked at the bullets bumping into her and falling to the ground.

- They actually don't work on me, sorry…

Anatoly looked scared at Kara, trying to understand what was happening.

- You don't even seem to be human… How is that possible? – He looked at Cayden James and then back at Kara.

- I am also not human!

Kara grabbed Anatoly by his collar and threw him against the wall, making him hit his head and pass out on the floor. Kara looked at Cayden's gun and melted it with her heat vision. He shouted in pain, feeling his hand burning.

- WHAT ARE YOU? – Cayden shouted extremely angry.

- Let's see if you can handle this! – Black Siren walked towards Kara and shouted as strong as she could.

Kara felt the blast but thanks to the ear protector she wore, it didn't affect her and Oliver. He was in a battle with Vigilante, punching and getting punched, beating the crap out of the guy and taking a beat as well. Oliver shot an arrow into his shoulder and Vigilante lost his balance, feeling weak and dropping unconscious on the floor.

- It's just a tranquilizer! – Oliver said as he noticed the look in Kara's face.

Diggle kept shooting Cayden and Vigilante every time he could, trying to help Oliver take them down. Black Siren looked scared for the first time that night, not believing what she was seeing.

- What are you? – She said, looking at Kara with a mix of curiosity and anger.

- The last daughter of Krypton! – She said as Black Siren tried to punch her and heard her bones in her hand cracking. She yelled in pain. – The girl of steel!

Cayden James looked terrified as he saw Kara with fury in her eyes attacking Black Siren. The meta was his strongest ally, and she was getting her ass kicked by that blonde alien. She could only be an alien since he never heard of Krypton on Earth, he thought. And he never had any idea they actually existed. For the first time in his life, he feared losing a battle. Oliver and Diggle stopped beside Kara as she stopped punching Black Siren.

- It's over, surrender! – Oliver told them

- Or I will make you surrender! You won't like it!

Black Siren tried her scream one more time and did nothing to the three of them. Oliver had to remember to thank Cisco later, he thought. Kara felt like she had enough, and she really needed to go back to her Earth soon, so she decided to go against them with all she had. She flew high on the sky and used her heat vision on Cayden's feet, making him walk backwards until his back hit the wall. She switched from Cayden to Black Siren, making them close their eyes, fearing she would burn them down. Kara flew towards Cayden James and with on punch from her, he fell unconscious on the ground. Oliver used one of his trick arrows to tie Cayden, Vigilante and Anatoly down. Kara went for Black Siren, putting her both hands on her shoulder.

- Someone told me you were always used by the bad guys as they offered you things in return, like freedom. You don't have to do it anymore; you can be free and chose to do the right thing. You have an amazing ability and you can use it for good.

- You don't know me! I don't want to be good!

- Deep down I know you might want to. I know how it is. I got to taste what it was like to use my powers for bad things, I did horrible things. I wasn't in control of my actions, so I got to see what could happen if I turned evil like that. Since I came to Earth, I chose to help people, make a difference. There's nothing better than the feeling of helping saving the world and making it a better place, so I am giving you one chance to change your mind. You will pay for your crimes on this Earth, but afterwards, you can have a choice. I know your other you from this Earth meant a lot for Green Arrow's team. I know you are not her, but you can be the same light she was. But if you pick darkness, there will be no turning back… And it's a shame… But it's up to you!

- And if I say I don't want to have a choice? That I want to stay as I am, because I like who I am?

- I could take you down here in a second and bring you straight to the prison. But I have faith that there is still some good inside you. Something hurt you and made you think this was the only way, but there is always another way.

Oliver watched as Kara spoke to Black Siren. He also felt like there was something good inside of her, but he was getting tired of trying to reach her. It was dangerous for his loved ones, his city, the world, so he decided to try to take her down and lock her down for good. And now he saw Kara Danvers almost reach that woman, with kind and wise words. It was a natural talent, he thought, but for sure, she was Supergirl, she used to believe the best in people as Barry once told him. Diggle looked from Oliver to Kara, noticing how Oliver looked at the blonde. There was something there, he could feel it. Sooner or later, Oliver would realize it too.

Black Siren looked at Kara, defeated. She knew there was nothing she could do against an invincible alien so she nodded with her head. Not even her screaming was helping. It sucked. Kara smiled as she nodded at Oliver. He used his trick arrows to tie her too and Kara held Black Siren and Cayden James to put them inside Diggle's van. Oliver and Diggle brought Anatoly and Vigilante and Kara decided to go with them to Argus, to make sure no surprises would happen along the way.

Back in the bunker, Felicity looked tensioned at them. Oliver walked in, smiling, telling her it was finally over. Felicity hugged Oliver and Diggle and then hugged Kara again, thanking her.

- There are no words to describe how grateful I am.

- Its ok, I'm glad I helped – She smiled looking at Oliver and then back at Felicity – I think Black Siren will think about what I told her…

- What? What happened? – Felicity asked

- Kara thinks there is still some good inside Black Siren… And so do I!

- How? The woman is terrible!

- She doesn't have a reason to live in fear, being threatened by others… I think she will do the right thing once she pays for everything she did! – Kara said as she smiled hopefully at Felicity.

Felicity dropped the subject since she knew they weren't going to change their minds. She has little faith on Black Siren and found it hard she would change, but decided to let them celebrate, they were free of the villain team once and for all. The city was safe.

- I have to go back, guys. But you know… I'm here for you, just a call away – Kara smiled as she hugged each and every one of them, leaving Oliver to be the last one she said goodbye to. – And you… Keep up with the good work, you are their rock, don't forget it.

- I won't. Thank you again, Kara. – He wasn't that much of a hugger but he knew Kara would make him hug her anyways.

Kara grabbed her device and opened a breach back to her Earth. As she stepped into it, it closed and she vanished from the bunker. Oliver kept looking at the place she vanished and Diggle put a hand on his shoulder, looking at Felicity and laughing.

- I think someone's smitten…

- Shut up, Jon! – Oliver said as he turned around, dying to change his clothes and go home.

He needed to go home and think. Think about how much he was going to miss a certain blonde and cheerful alien.

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NOTES 2:

Spoiler Alert:

Next one is also a prompt: from WritersBlock039: "Maybe a charity gala at CatCo or L-Corp, or a gala on Earth-1, and either Oliver or Kara makes the jump to be the others' date?"