Disclaimer: I do not own DC Comics or the CW TV shows Arrow, The Flash, Legends of Tomorrow, Supergirl or any other characters or elements pertaining to the mentioned franchises.

Kara was strapped to a surgery table, naked, red sun radiation shining on her from the lamps above as she groaned, feeling weaker, while the scientists were extracting her blood as she had uncomfortable flashbacks from the Nazis and Thawne trying to take her heart, when Thawne was giving orders.

"How much blood do we have?" Thawne said.

"Almost enough." The scientist said.

"When I get out… I'm gonna kill you." Kara sneered, making them all chuckle.

"Oh, please, Miss Zor-El, don't make me laugh." Thawne said.

"You think I'm not gonna kill you?" Kara glared. "I'm not the same self-righteous naïve girl you remember."

"But you're alone." Thawne smirked. "All the times I've tried to end him… and now I'm not alone." He pulled out a scalpel, cutting into Kara's arm.

Conner was restrained to a chair, unable to move, his powers nullified because of the red sun radiation. "What are you doing to me?" He demanded before they put some helmet with goggles on his head. "What is this?"

"Dr. Watson. We're ready." One of the scientists said and she sighed, hesitant. "Eve."

Eve hesitantly pulled the lever and Conner screamed as electricity surged through the helmet.

"Starting reconfiguration." One of the scientists said.

"Creating the clone cost us $3 billion. And it's time for Subject 13 to return home." Otis, Lex's henchman, said as he turned to Eve, seeing a flicker of remorse in her eyes. "Do you have a problem, doctor?"

"No." Eve said quickly, masking her feelings.

The Flash sped through the guards, knocking them down, while Atom fired from his blasters, shooting them before the Flash grabbed one of them by his neck.

"Where's Supergirl and the clone?" The Flash demanded, glaring as the guard was silent.

"Tell us or I'll blast your head off." Atom said, nearing his blaster to the guard's face as he gulped.

"Two levels below. There's a lab area. I don't know if they are there now but we've got orders to take them there." The guard said.

"Thank you." The Flash said before knocking the guard out. "Hang on."

"Don't worry, we'll find them." Ray assured him.

The Flash and Atom went out from the elevator, while Mr. Freeze appeared with his freeze gun.

"Don't come any closer." Mr. Freeze said.

"We don't want to fight you but we will, if we have to, Victor." Atom said, aiming his blaster at Mr. Freeze.

"I can't let you go through here." Mr. Freeze said.

"Then we'll make our way through you." The Flash said, dodging Freeze's beam. "At least it's not a Cold Gun."

Atom blasted through the ice wall, knocking Mr. Freeze back, trying to reach the scientist. "You're not a hired gun, Dr. Fries. You're a scientist. Why are you doing this?"

Freeze hesitated, knowing he was not going to win. "They promised me a cure for my wife."

"We can help your wife. Just help us." Barry pleaded.

"I can't let you go!" Freeze protested, shooting again as the Flash and Atom barely dodged.

"Sorry about this." Barry said before throwing a lightning, incapacitating Freeze and disabling his suit, making him unable to move.

"Who knows who else do we have to deal with." Ray noted as they entered the elevator but it stopped as the door opened a few levels below.

"You just had to say it, did you?" Barry groaned as he spotted an old enemy.

"Long time, no see, Barry." Mercer quipped.

"You." Barry glared.

"Let's play." Mercer said, throwing a disc that Atom tried to shoot at as Barry tried to stop him.

"Ray, wait, don't—"

An explosion followed, a flash of light blinding them. Barry tried to speed at Mercer but realized that he had lost his speed as he ran normally.

Mercer threw some device that pulled Ray down, pinning him to the floor.

"I can't move!" Ray said.

"Magnetic puller. You won't get out." Mercer said.

"Let's see how good you are without your toys." Barry glared, kicking Mercer in the hand, in which he had another device, before Barry grabbed Mercer's belt and threw it away. "No gadgets for you this time."

Barry rushed at Mercer as they exchanged blows. Barry dodged as Mercer threw a right hook and Barry hit him in the chest and knocked him back as Mercer staggered. Barry dodged Mercer's kick but Mercer grabbed him and slammed him to the ground. Barry rolled on the floor, exchanging positions with Mercer before Barry repeatedly pummeled him in the face but then, Mercer headbutted Barry, knocking him back as Barry got up, dazed and staggering.

Ray had managed to smash the device that was pinning him down and Before Mercer could finish Barry off, Ray hit him in the head from behind, knocking him out.

"Thanks." Barry said as he glared at Mercer. "I hate this guy."

"What should we do with them?" Ray said, eying the incapacitated mercenary.

"We don't have time, we need to find Kara." Barry said.

Kara breathed out, weak because of the red sun and reliving Thawne trying to take her heart or her day being mortal as she realized how egoistic she was with her powers before an explosion went off and the red sun lamps turned off and then the emergency lights turned on.

Kara tried to struggle out but was still too weak.

Barry and Ray kept going down the area before they heard an explosion and from above descended Arsenal, Huntress, Nightwing, Golden Glider, Kid Flash and Raven.

"Hey." Roy said.

"How did you find us?" Ray asked.

"We had a lead." Dick explained.

"Who's this?" Ray turned to Rachel.

"Call me 'Raven.'" She smiled.

"Damn it." Thawne said as he turned to Kara.

Before he could do something, an explosion went off as a part of the wall crumbled. Thawne grabbed the vials with Kara's blood and sped off as the door behind him closed and neither Barry or Wally were able to phase through because of some force field as the rest took out the guards and scientists.

"Kara. Kara." Barry neared her, smacking her on her cheek. "It's me. It's Barry."

"Barry…" Kara whispered weakly as he undid her restraints

"It's me. It's gonna be OK." Barry promised, freeing Kara, while Roy picked some sheet, covering her naked body. "Where's Conner?"

"Dr. Watson. We're leaving." Otis ordered as they were packing up, while Eve stared at unconscious Conner. "Doctor."

An explosion went off as Otis and his men ran off, while Eve went to Conner, trying to free him.

"Let him go!" Barry ordered, rushing at Eve.

"Wait! Wait! I can help you!" She cried out, raising her hands in surrender.

"I swear, you're going to—"

"They said we would help Subject 13, I didn't agree to this!" Eve exclaimed, causing for them to stop.

"Wait, wait, wait, did you say 'Subject 13?'" The Flash demanded, his eyes widening in realization, suspecting who she was. "Who are you?"

"I'm Eve Watson. I lead the project of recreating him." Eve explained.

"You created Conner?" Kara demanded and Eve nodded.

"But I swear, we thought we were helping humanity. We were supposed to enhance people, cure diseases, not create a weapon!" Eve said, terrified.

"What did you do to him?" Clark asked, turning to Conner.

"They wanted to reprogram him." Eve explained as everyone glared at her.

"You mean 'brainwash.'" The Huntress sneered.

"I swear, I didn't agree to any of this." Eve said, clearly regretful.

"Did Lex Luthor fund this?" Kara asked and Eve nodded and they snorted.

"Figures." Barry grumbled before he turned to Eve as he took a breath. "OK. Can you testify against him?"

"That's a bad idea." Lisa protested.

"We need solid proof to take him down." Ray pointed out.

Suddenly, a gunshot went off as everyone turned around. Before either the Flash, Kid Flash or Superman could make a move, Conner came to and sped in the way of the bullet, that had kryptonite tip as he groaned and passed out on the floor.

Kara glared and rushed at the guard holding a gun, struggling to disarm him without her powers. The guard hit her in the face but Kara pinned him down and glared, relentless rage taking her over, beating him up repeatedly as his face was bruised and bloodied, while she screamed like a feral animal.

"Supergirl, stop! That's enough! It's over!" Clark ordered as he and Barry held Kara as she panted out, blood spattered on her body as she stared and breathed out before Barry measured the guard's pulse as he stared at her in horror.

Later

In the plane, Conner was on a stretcher, unconscious, while Barry helped Kara with a shower and put on some clothes as Kara stared, silent and numb, seemingly oblivious of her surroundings, while Barry held his wife's hands.

"A.R.G.U.S. searched the place but the bad guys had taken off by the time they arrived." Wally said and Roy groaned.

"Damn it. I think we've got only one play left." Roy said.

"Kara. Kara. Please. Talk to me." Barry said with pleading eyes. Kara breathed out, on verge of breakdown before the floodgates opened as she sobbed into his shoulder, while he hugged her. "It's OK, Kara. It's OK."

It took minutes, even though it felt like a lifetime before Kara got ahold of herself.

"Kara… it's over. You're safe now." Barry said as she breathed out, clenching her fists.

"They… they… they tried to—"

"I know. I know." Barry nodded as he held her, assuring her. "I'm never going to let anything happen to you, or Conner."

"None of us are." Clark promised as he entered. "We'll always look out for you."

Kara panted out before she swallowed, on verge of tears. "I killed a man."

"It was either him or us. You can't blame yourself for protecting us." Barry said.

"No. No. This was different." Kara said. "I killed Reign because I realized that I had to. But this… all I felt was… fire… rage—"

"What you feel, is completely human. That's not making you a monster. Just tell me, did it make you feel any better?" Barry asked and Kara shook her head. "Good. Remember that. Hold on to that doubt. That's what separates you from monsters like them. They kill because they want to and take joy in killing. But we don't kill unless we have to. Unless we have to do whatever it takes to protect each other."

Kara nodded, understanding as she panted out, while Barry and Clark hugged her, doing the little they could to comfort her.

Later, A.R.G.U.S.

"Thank God you're OK." Alex said as she and Winn hugged Kara tightly before noticing how… different she was, obviously traumatized.

"Kara… are you…" Winn hesitated.

"Let's just give her some space." Barry said as they accompanied Kara, while the rest accompanied Roy to the infirmary.

"How's Conner doing?" Clark asked as Alex and Caitlin were examining Conner, who was comatose and on the stretcher.

"I removed the fragments but the kryptonite poisoning has gone very far. It may be too late to help him." Alex said.

"Come on, half of his DNA is from a guy that can lift skyscrapers." Steve said.

"Look, it's not about speed or strength." Eve said. "In order to save him, we would need a level of radiation that isn't on this Earth. We'd have to fly him into the sun and there's no time for that. His condition is getting worse every second. We'd need a magical miracle or sun right here to save him."

"Magical miracle…" Alex repeated, an idea hitting her.

"You healed Roy, do you think you can heal Conner?" Alex asked Rachel.

"Uh, I can try." Rachel said. "But frankly, even I'm not sure if… I mean, I still have no idea of the extent of my powers."

"Just try." Clark said.

Rachel nodded, touching Conner's wound as it healed, while the heart monitor showed stable.

"It works." Kara said, hopeful and Conner's eyes suddenly opened as he got up, grabbing Rachel by her throat as she screamed, his eyes void of any emotion, staring coldly.

"Conner! Let her go!" Barry said as he, Kara and Clark tried to pull him away from Rachel.

"Conner, stop! She's a friend!" Clark shouted as Oliver, Laurel, Sara, Tatsu, Henry, Roy and Dick with J'onn J'onzz entered.

Rachel's eyes turned pitch black as she knocked Conner back with telekinesis and then the windows shattered and everyone struggled for breath as she was filled with rage.

"Rachel! Rachel, stop!" Roy shouted, grabbing her as she took a breath and came to, her eyes turning normal.

Conner got up, about to attack her again before Clark hit him in the head from behind, hard, knocking him out.

"What the hell happened?" Roy inquired.

"This is Conner's brain scan, when we found him in the lab two years ago." Caitlin said, showing them the images on the screen.

"And this is his current brain scan." Alex said, while Conner was in an induced coma. "It's the same as the one that they wanted him to have, when they created him. Dr. Watson confirmed it. Basically, in that lab, they reprogrammed him."

"Into a killing machine. Just like Eiling wanted." Barry surmised as Kara and Clark clenched their fists.

"Is there a way to reverse what happened?" Oliver asked.

"In theory, there might be." Alex said.

"But?" Clark asked, already knowing there was a catch.

"Worst case scenario, complete amnesia. He wouldn't remember anything at all." Caitlin said.

"I think we don't have a choice." Clark sighed.

"Are you OK, Rachel?" Roy asked, while Rachel massaged her neck.

"I'm sorry, Roy. I—"

"Hey. It wasn't your fault. No one could've expected this." Roy assured her, holding her by her shoulders. "You did what you could. Don't beat yourself up."

Rachel nodded.

Elsewhere

A scientist entered Lex's office with a vial. "Is this it?"

"The virus is finished, sir. But we haven't had time to test it, so we don't know if it works." The scientist explained.

"I think I have a good way of testing it." Lex smirked.

Recently, I've been reconsidering continuing Barry/Kara in this series because of my realization of Kara being so self-righteous, she avoids killing even at the cost of an innocent life, at least in Season 3, but since Season 4, while still not using killing as first resort, she seemed to be more open to killing if not having a choice, considering her final showdown with Lex, while Barry, not willing either, is open to killing if necessary but then I remembered I had removed Kara's self-righteousness already in my story "The Hardships We Face" but honestly, I realized that in order for Barry/Kara to work, neither of them should have a stick up their asses and be so self-righteous and averse to kill, well, Kara, to be more specific. And while Clark and Bruce don't kill either, they are open to the option too, without them being the ones to kill. And here, Kara has been traumatized by the experiments, so hope it makes sense, what I did.

Kind of getting off-track here but frankly, I realized that pairing Kara with any of the other heroes in Arrowverse or DC Comics in general cannot work, if you do not take her self-righteousness out of the equation and she is more open to killing. At least since Season 4 she doesn't have a stick up her ass and is more open to killing, if necessary.

So, what do you guys think?

Please review and let me know if you have been enjoying this and want for me to continue.