Disclaimer: I don't own Supergirl or the characters. This is written purely for fun.

A/N: I started this before the Season 4 finale so to make everything work I am ignoring the last 15 or so minutes of the episode. It picks up just after Supergirl dropped Lex.

"Where are you?" Alex asked over her radio once Lockwood had been subdued.

"Trying to find Lex. I thought I had beaten him but he just kind of vanished." Supergirl said.

"Be careful." Alex warned.

"I will. Wait is that Lena's voice?" Supergirl asked before the radio link terminated leaving Alex with a sinking feeling.

As Supergirl flew towards where she had heard her friend she wondered how much danger Lena was in. Landing in front of the building she ripped a door off its hinges before heading towards the voices.

As Supergirl approached the room where she had heard Lena's voice she listened into the conversation and realised Lex had told Lena who she was. Part of her wanted to run and hide, but she knew she had to face Lena and stop Lex. Taking a deep breath she opened the door and immediately saw a smile come to Lex's wheezing face.

"The woman of the hour, well the alien of the hour." He greeted.

Ignoring him she looked at Lena and saw the pain and betrayal written on her friend's face.

"I'm sorry." She said.

"Sorry doesn't start to cut it." Lena said.

"They are all the same sis. Kryptonians are evil." Lex wheezed.

"Shut up Lex." Lena snapped, not wanting to deal with her brother as well as the betrayal.

"I know I should have told you, but I didn't want to destroy our friendship." Supergirl said. "When this is over I will take whatever punishment you want. But right now we need to focus on fixing things."

"Let me get this straight. You lied to me for years. Betrayed me. Made me needlessly worry about you. And now you want me to help you?" Lena asked.

"I need you Lena, I always have."

"So you used me?" Lena asked.

"What? No." Kara said before noticing that Lex had disappeared. "Where did he go?"

"He can't have gone far he was dying." Lena said before noticing a syringe. "He's taken more of the Harun-El."

"So he has powers?"

"Probably." Lena said.

"Do you have any of the compound to strip his powers?" Kara asked.

"Not on me. There is some back at L-Corp." Lena said. "I will help you stop him. But when this is over, never speak to me again." Lena added coldly.

-00-

"Where are you?" Alex asked as she rode in the rain through National City.

"Looking for Lex. He has taken the Harun-El. I have the compound to strip his powers, but right now I can't find Lex."

"I can assist." Brainy said over the radio. "Reports are coming in that he is at Jefferson High School. He is attacking it."

"Why?"

"There are aliens there." Brainy explained.

"I'm on my way." Supergirl said.

"Wait for me to get there." Alex replied swinging her bike round a corner and accelerating.

As Alex raced through the rain towards her sister's location her bike aqua planed and she lost control. As the bike fell and skidded across they road, screeching and sparking as it did so despite the torrential rain, Alex hit the road and glided along the tarmac. Her progress eventually halted by hitting a parked car. After which she lay unmoving as the rain pelted her body.

-00-

"The American traitor arrives." Lex said to the TV camera as he pointed at Supergirl.

"You are the only traitor." Supergirl said.

"You attacked the White House." Lex reminded the viewers.

"That wasn't me. You were behind that. You tricked Red Daughter into attacking."

"Red Daughter?" Lex asked.

"My clone."

"And people call me mad." Lex laughed. "You are either delusional or treating us all like idiots. You were behind the attack and you will pay for your crimes." Lex said before blasting her with a Kryptonite blast. One she could hold off with the upgraded suit device that Lena had given her.

"You've been upgraded." Lex commented. "But you haven't seen me at my full potential yet, and I have new toys." He added pointing to a long object on his back.

"Likewise." Supergirl said as Lex fired again and she used her heat vision. As they fought, teachers and bystanders hurriedly tried to evacuate the school.

For several minutes the duo traded shots, each not delivering the killer blow. But then finally Lex fired and the device on Kara's suit that Lena had given her broke.

Smiling Lex said.

"Well it's been fun." He then tried to blast her with the Kryptonite beam again. Only this time the beam seemed to splutter into life and then disappear.

"Looks like you are out of charge." Kara commented.

"Well, it's not like there is sun to help you." Lex countered. "Well not for several hours. While I only need a few minutes. But I have had fun warming up for the battle against your cousin." He said unfazed by Supergirl approaching him. "Tell me, is he as dumb as you?" He asked as she continued her approach. When she was a few feet away she suddenly felt herself getting weak.

"Did you forget this whole suit is about Kryptonite?" He asked laughing as he stepped towards her weakening her further. As he approached she saw the green glow from where his suit had opened up. "Now, I guess I could just stand near you and wait for the Kryptonite to slowly, but painfully kill you. But that will stop me removing the alien brats from the school. So I have a better plan." He explained as he reached for the weapon he had been carrying on his back. As he unsheathed it Supergirl got weaker still.

"A Kryptonite sword modelled on what the DEO used to have. The same one that killed your aunt." He said holding the blade against Supergirl's face enjoying the anguish and pain on her face. But despite her weakness Supergirl managed to climb to her feet and stare him down. Smiling once more he pulled back before driving it into Supergirl's stomach.

As the Kryptonite blade went through her abdomen she used the last ounce of strength that she had to lunge at him and stab Lex's face with Lena's power stripping formula.

As they both fell to the ground their faces inches apart Lex panted.

"Looks like I win. Don't worry, you won't be the last Kryptonian I kill."

Feeling all her strength fade away Supergirl tried to grasp the blade but didn't have the strength. Waving her arm again she suddenly felt something hold onto her.

"Alex?" She gasped hopefully.

"No." Agent Jacobs said as he examined the wound. Unsure what to do he padded the wound to stop further bleeding before ordering the rest of his squad to lift Supergirl onto a stretcher.

TBC...

A/N: Thanks for reading and reviewing.