A/N - Sorry I haven't been updating as frequently. School is very busy but now I'm on break! Also to anyone who's watched the first three parts of Crisis on Infinite Earths, what were your thoughts? I'm very excited for the conclusion! Season 5 of Supergirl itself has also been really amazing (I still haven't watched Season 4, so there are a couple of plot points from there that I'm not understanding but mostly I've been able to follow Season 5!) There's a slight Bleach inspiration if you catch it in here (hint: Kaien Shiba), but I'm satisfied with how the ending is going to go. I hope you enjoy this chapter and again, thank you for staying with me!

A loud crash filled the DEO, startling Kara and J'onn from levels away.

"We have to move faster, J'onn. We don't know what we're dealing with still, and Maggie and Jeremiah are already with Alex, I can hear their heartbeats in one place."

"Maggie is in there somewhere. She tried sending a message to Alex, but even with everything disabled something is still controlling them. I don't know if Jeremiah is still there, but somehow he's formed the equivalent of a mind meld to Maggie, and they're able to psychically communicate with Alex."

"So what does that all mean? Can you communicate with them too?"

"I can't, it seems like for me it's a one way thing. I can intercept the messages and hear what Maggie is saying to Alex, but I can't respond to her, and I can't hear what Alex is saying if she's saying anything back. So even if we manage to subdue them, there's little chance we can get him back, and if we don't make it on time, we won't be able to get Maggie back either."

At that moment, the realization settled in on both J'onn and Kara. There was a chance that only one person could make it out alive after the battle.

Lena and Lillian were still in a standoff. "You know that your friends here aren't that smart. Alex might have turned off all of the technology in the whole world, she could have turned all of the psychic inhibitors on and activated whatever she wanted to, and it still wouldn't free Maggie and Jeremiah of their mind control."

"What do you mean?"

Lillian pulled the neck of her shirt back, revealing a small device that was just below her left shoulder. "It's fused into my skin. Even if the switch in my hand broke, even if you destroyed all of the technology that's on me, they're still under my control. The only way you turn it off is if you kill me. Supergirl doesn't kill, J'onn doesn't, and Alex is going to be too weak to do so once they're done with her."

"What if I just cut it out of you?"

"That still wouldn't work." Lillian sneered, smoothing out her shirt. "This device is pumping cells into my body as we speak. I told all of you there could have been an easy way, but you collectively decided to make it more difficult for yourself. Even if you were to remove it, there would still be millions of cells multiplying in my body. I can control them however I want, and if you all are still acting like brats I'll just put an end to all of their misery. Jeremiah's already fully succumbed to it, it's a matter of hours before Maggie will be too. Either way, Team Supergirl loses."

"So if Supergirl let Alex kill you in the first place, this would have all been over?"

"Lena, you still don't get it. It's not that simple."

This is it, Alex thought to herself. Maggie and Jeremiah were standing before her again, their eyes dark. She was ready to save them, whatever it took to do so. She decided on defense tactics, so that she wouldn't have to resort to lethal measures to kill them.

Maggie was the first to lunge at Alex. She managed to kick Alex down in the first swing, while Alex rolled out of her way before another kick could be delivered. Alex jumped up before dodging another one of Jeremiah's punches.

The fight had continued like this, with Alex attempting to evade every attack Maggie and Jeremiah had tried to place on her, save for a few blows. Alex knew she couldn't hold them off for much longer, but there had to be some way to save them. She had one more idea that she thought of, but it was going to be a risk to all three of them. Still, this was a battle that had to be done alone.

About ten minutes had passed when Kara and J'onn finally arrived. Alex glanced over and looked in shock.

"No!" Alex yelled and reached for another button, effectively knocking Kara into a forcefield as she tried to speed into the fight.

"Alex!"

"This is my battle. I know, we're stronger together but please Kara, you have to understand that I need to finish this alone, no matter the outcome."

J'onn looked onto the fight before glancing down.

"J'onn, can't you do anything? Phase us through, something? They'll kill her!"

The martian was conflicted before speaking. "Alex is fighting for her honor. If we were to step in and help her, even if we managed to save Jeremiah and Maggie, it will still come to a great cost to Alex. I know it's risky, but she needs to do this alone for her own sanity, Kara."

Kara looked on, still trying to slam on the forcefield. "She's going to die, J'onn. We have to save my sister."

"Just wait. If things get serious we'll find a way to step in, but for now, I'm telling you Kara, she has to fight alone."

"How much time do we have before the cave blows?"

"Two hours. Vasquez and the others have gotten all of the surviving Cadmus members and they're all moved to the National City headquarters. The only people I can sense here are us five, Lena and Lillian."

"Lena's still in here?"

"We'll find a way to get her out before then."

More time went by as Alex still tried to defend herself. She was bleeding heavily in her mouth, being punched a few times. Kara and J'onn still watched on intently.

Suddenly, Jeremiah had knocked Alex down and pinned her to the ground, punching her in the stomach repeatedly. Kara started slamming on the forcefield again in horror, and J'onn was ready to phase through. At the sight, Maggie somehow paused, looking on emotionless. It was almost like she was holding herself back.

Alex tried to speak, flashbacks of the past couple of months all coming back. She still had hope, a strength she learned from everyone rallying around her for so long. "You have to stop this. I know you two are still in there somewhere, even if your brains are compromised forever." She coughed at the next blow to her stomach. "I love you both so much, I still forgive you for everything."

Alex looked over to J'onn. J'onn, if you hear me right now, I need you to phase us back to the medbay. You should be able to phase into the forcefield. Do it quickly.

J'onn nodded, grabbed Kara, and phased through as Alex asked. He held onto the four people and flung himself upwards.

Lena was startled at the sight of the five of them appearing next to her. Jeremiah still had a grip on Alex, when J'onn grabbed him and flung him backwards.

Alex got up and grabbed two syringes that were on the table. They were the two cures for Maggie and Jeremiah, though they were both unfinished. She flung the one with an M to Kara, who injected it into Maggie's neck. Maggie collapsed into Kara's arms, slowly coming to her senses.

"Let's hope this works." Alex muttered to herself before readying herself. She was limping now, her shirt and face soaked in blood.

Alex and Jeremiah ran towards each other at the same time, while Lena, Lillian and J'onn looked on.

A scream was the only noise filling up the cave. Kara jerked her head to the direction seeing Alex collapsed on top of Jeremiah, the syringe in his neck.

Everyone widened their eyes at the sight of Jeremiah's enhanced hand in Alex's stomach. Kara got up in horror, placing Maggie down near Jeremiah and rushing to Alex's side.

"Alex, Alex stay with me." Kara held pressure onto Alex's stomach as the older Danvers coughed.

"I'm fine. It missed my internal organs, from what I could tell. Get Lillian."

Kara looked over at the older Luthor, who was still smirking. She grabbed her and slammed her against the wall, stepping on the remote that fell out of her hands.

"You've done enough damage. Now tell us how to turn this off. Answer me!"

Lillian looked at Kara. "You can't."

Alex stumbled as she got up, dragging herself to Jeremiah and Maggie. J'onn rushed to Alex's side, helping her get to them. The three of them were all weak, Alex from the injuries and Maggie and Jeremiah from the mind control.

"Alex, listen to me, there's not much time." Jeremiah looked over at Lillian before looking back at his daughter. "I've been under this mind control thing for much longer than Maggie has. Those neurotransmitters, they're embedded into my brain. You can get them out of Maggie's system, but you can't save me."

"No, Dad. Don't say that. There's always a way, and we're going to save you."

"The cure wasn't finished. This past fight has weakened me enough for it to even bring me back, but only for a little while. If they shut off, they'll kill me. If they stay on, I'll become sentient, Lillian programmed it for me to destroy anything in my path. I'll wind up killing you, killing Kara, your mother. You have to let me go."

"I can't."

"You know, I'd hate to break this family reunion, but as I told Lena, you can't shut it off. Not without killing me. So instead, you get to watch them die."

With that, Maggie and Jeremiah instantly began to scream. The neurotransmitters in their system were slowly destroying their bodies from the inside out. Kara was wide-eyed, conflicted. She knew this was Lillian's failsafe, as she knew Kara wouldn't kill anyone, regardless of what they've done.

J'onn looked onto Kara and Lillian as a gunshot rang out. Lillian looked down, seeing a pool of blood to seep into her shirt.

Everyone slowly turned their heads when they saw the source of the gunfire. Kara let go, letting Lillian fall to the ground. Lena had shot her mother right through her chest.

"Like Kara said, you've done enough damage. Not only did you destroy whatever little remaining love I had for you, you tried to get my best friend off of this planet, hurt my friends, no, you hurt my family. Goodbye, Mother."

Lillian looked at her daughter, her breathing becoming shallow. She let out a strangled laugh, coughing up blood. "I commend you, Lena. I guess I was wrong, you really aren't like your brother. He wouldn't have the guts to kill me. Your side has won, for now." Lillian closed her eyes, letting out her last breath.

It took a minute for a stunned Kara to register the weight of what Lena had just said. She figured out that she was Supergirl. She still called her her best friend. Her family.

Jeremiah and Maggie sighed in temporary relief. The former looked over at Lillian's lifeless body and then to Maggie. "Alex, you need to get them going on the cure for Maggie."

Maggie just chuckled, still weak. "Lena Luthor and the Danvers family saving the day again."

J'onn looked up. "I just contacted Winn to work on finishing the cure. But before all of this, we need to get you all out of here. The cave is going to blow in ten minutes."

Kara looked back at Lena. " Lena, do you-"

"No, leave her here. I don't ever want to see that again."

Kara and J'onn both nodded. The former took Lena and Maggie while J'onn took Alex and Jeremiah.

As soon as the six landed, Maggie, Jeremiah and Alex were placed on medical beds. Alex had her wounds cleaned and treated. Thankfully Winn and Dr. Hamilton had been working on a field medication that would speed the recovery of an agent. This made Alex's head wounds virtually disappear, while her stab wound was brought down to a minor scratch. Maggie was rushed to one bed to get the cure into her bloodstream, while Jeremiah had an IV placed into him in the other bed. He screamed in pain, knowing that the neurotransmitter cells in his body were starting to shut down. Dr. Hamilton was doing everything to help with the cure for him, but no one knew what to do.

"Dad, we're going to find a way to save you, just hold on."

Jeremiah let out a soft chuckle through the pain. "As much as I hate to admit it, Lillain was half of what was keeping me alive. I was connected to her life through these damn cells. Now that she's gone, which I'm happy that she is, I can die in peace."

"No, you can't. We just got you back." Alex grabbed his hand, starting to cry. Kara stood next to Alex, slowly stroking her hair. Lena and Maggie looked on as the family started to say their goodbyes.

"Honey, there's no way to save me now. These cells are what makes my entire body now. They're starting to die, and once they're completely dead, I'll be too. The other half of what kept me alive was you. Remember when I said you were always the best part of me? You're the reason I could even keep my humanity. You, Kara, your mother. You guys are the epitome of what makes us stronger together."

Alex looked down, finally coming to terms with what was happening. "So now what do we do?"

"I'm going to die with honor and with my two daughters beside me. You saved me, and I'll be watching over my girls." He glanced over at Maggie, Lena and J'onn. "Maggie, thank you for everything you've done for both of my daughters. I don't know if Alex could have ended up with anyone better. Remember what we discussed, when the time is right. Lena, thank you for the courage you must have needed to end this. And J'onn, you've kept your promise all of these years. Be the father figure you have been for all the years that I've missed. I know you'll keep your promise. All of you, take care of both of them." He coughed, his body getting heavier.

Both Alex and Kara were crying now, watching Jeremiah slowly succumb to his injuries. "Tell your mother I love her, and that if we meet again I'll make up all of these lost years, all of the pain I caused. I love you all. I'm sure I'll see you again one day."

He gave one last squeeze to Alex and Kara before drifting away.

Everyone sat in silence for what seemed like hours. Finally, Maggie spoke. "Alex."

Alex got up slowly. She wiped the tears off of her face and pulled Maggie into a deep kiss. "I've missed you so much. I love you, I love you, I love you."

"I'm back, and I'm not going anywhere. Not anymore." She pulled Alex into a deeper hug. Both of them were crying for a different reason now. "You saved us all, Alex. You've been fighting for so long, and you've been so strong this whole time. Now it's time for you to let go. I love you, Alex Danvers."

A/N - There's still at least two chapters coming, and I do hope to have it done by New Years (though work has been slamming me with hours since I've come home). I was going to split this into two chapters but I think you all deserve the big conclusion of this in one after a long wait. When first creating the story, I always envisioned that Jeremiah and Lillain were going to die, though I'm sure this could have come off as a surprise to all of you. Again, I'm so grateful for all of you who have stuck with this and appreciate all of the reviews and feedback. I hope you enjoyed this chapter, and I can't wait to share a spin-off of one shots I'll do and the conclusion to this. So, again, thank you so much!