A/N: Not sure if this will be the final chapter or not. It was going to be but I can't help myself and want to write one more chapter about Jeremiah reuniting with his family.
Lillian Luthor wasn't taking any chances with this last fight because unlike the others, where Alex took her time before moving on to the next battle, a door opened up and Cyborg Superman stepped out searching for his target. Alex ducked around a corner so she wouldn't be spotted but it didn't matter because Hank had locked onto his target and moments later, a red laser shot through the wall near her, blasting out chunks of concrete and metal wire mesh. Alex scrambled from the blast but another beam shot through and she was forced to keep moving or be killed. His attacks were relentless and soon every breath she took was painful.
She slowly realized that the attacks had stopped, and panicking that Hank was planning something big, quickly peered around the corner to see where the human-machine hybrid was. She spotted him but unfortunately so he saw her too and he looked right at her and...winked? She thought she had been hallucinating, which given the amount of blood loss and how exhausted she felt was definitely a possibility, but then she heard J'onn speaking to her telepathically for her to play along.
Long story short, ever since Kara saw Jeremiah and he helped her and Mon-El escape CADMUS, J'onn had started keeping psychic tabs on Alex because he knew as time went on that she might do something reckless just to see him. Tonight when Alex failed to return to work and check-in, J'onn had cast out a telepathic net until he reached her mind and focused on what was happening. He had made a promise to Jeremiah that he would watch over his daughters and that's exactly what he was going to do. The Martian had reached the facility first and started to impersonate various people until he ultimately saw the real Hank Henshaw and had the opportunity to knock him out, injecting him with something that would keep him out for several hours and dragging his body outside to hide in the surrounding woods.
While he 'spoke', Alex moved to a different section of the warehouse and J'onn purposely looked for her in all the wrong places so she could recollect herself. He also taunted her out loud since it's what the real Henshaw would have done. J'onn and Alex had sparred for hours continuously for months when Alex first joined the DEO so they were very good at reading each other. J'onn would 'call' out different moves he was going to make so Alex could have time to counter him if she wanted, they couldn't very well make it a one-sided fight and risk Lillian finding out the truth. J'onn wasn't using his full strength against Alex, but that was okay because the real Henshaw wouldn't have either. CAMDUS wanted Agent Danvers alive. They took turns exchanging blows until with one final move, Alex slammed Hank/J'onn's head down into a metal guard railing and he stumbled upright before finally collapsing onto the ground.
Alex staggered into the control room and found Kara and Jeremiah gagged and bound to chairs, the only light came from the Kryptonite lights above, casting the room in an eerie green glow. Neither of them looked worse for wear but looks could be deceiving, CADMUS did have Jeremiah for a decade. A huge television on the far wall was replaying some of Alex's fights until it flickered to show Lillian Luthor, Skyping from wherever she really was. Alex couldn't really be surprised though, Lillian was a smart and calculating person. She wouldn't physically be here just to have Alex potentially take her out in a fourth fight. Granted Alex already had numerous injuries, but anger was a really good motivator and with adrenaline it would be as if there were no injuries. For a brief second before quickly composing herself, the Luthor matriarch actually looked speechless and a bit furious when she saw Alex standing there, expecting to see her Cyborg creation (luckily she was none the wiser about J'onn) instead to inform her that Alex had come up short. Lillian simply scoffed and said, "While I may be impressed that you won this battle, the war is far from over and has just begun." Alex's response was to smirk as she pulled out gun and shot the screen, shattering the screen upon impact and cutting off communication from the CADMUS leader. She walked as best as she could to the two hostages and all but collapsed near Kara, struggling to untie the ropes that bound her sister.
J'onn entered the room a few minutes later, he had been busy disabling all the surveillance feeds and taking out the guards that were posted at the exit to keep them from leaving even though Alex won. During his search, J'onn found armed bomb, Lillian's fail-safe, and quickly deactivated that as well. He went over and bent down to help untie Jeremiah as he performed a quick scan of his mind to make sure it was really Alex's father (not some brainwashed version of her dad) and once they were away from the Kryptonite, Kara used her X-ray vision to look for any implants or tracking devices in her adoptive father. Alex had been supporting Kara while they walked away from the green room but now her steps were faltering and Kara, now mostly recovered, wrapped an arm around Alex and carried her weight.
The group reached the exit with no problems but now was not the time for hugs and reunions because they weren't out of the woods yet, both literally and figuratively. Alex activated the EMP causing the lights above to pop as they rained down a shower of sparks, plunging everything in darkness, save the full moon watching over them like a guardian angel, and then guided Kara to the SUV with directions to where she left it. The four of them piled into the SUV, J'onn in the driver's seat, and sped out like a bat out of hell. Once they had driven a safe enough distance without anyone tailing them and Alex knew they would all be safe from CADMUS, it was as if the weight of the world was lifted off of her shoulders and she let go of the breath she felt she had been holding to breath again. She had so many questions to ask her father but she was so tired that she just decided to close her eyes and rest while J'onn drove them back to the DEO. There would be time to process and catch up later.
Alex came into this challenge with only an 18% chance to win, but she had come out on top. She had completed her mission to bring her father home and that was the most important thing to her. CADMUS was still out there but finally after all this time, Jeremiah was coming home.