Lena is apart of Crisis on Earth X.

Lena had realized that it seemed very quiet in National City. Super girl hadn't been spotted or a few days. She's tried to call Kara and had gotten no answer. Alex had also disappeared without a trace. Weird...

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Meanwhile on Earth X

Kara used her lasers to blast a Nazi through the side of the church.

"I hate Nazis!" She said with anger burning in her eyes.

"They always ruin everything." Mick said blasting a Nazi coming up behind Caitlyn/Killer Frost with his gun.

"Thanks." She said before turning around and finishing him off with a burst of ice straight through the heart. "Tsk, tsk, tsk. Gotcha Nazi." Killer Frost said smiling with glee.

Suddenly a boom was heard throughout the place and a flying woman followed a river of falling bricks. She went directly after Kara who was distracted with Alex and Sara fighting off a group of Nazis firing guns. Taking out Kara with a blow to the chest she was able to drag her up and out the hole she had created.

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Kara woke up on the roof of a building staring at a woman with powers very much like her own. Confused she got up and prepared to fight her way out of whatever this was.

"Who are you? What do you want?" She demanded.

The woman chuckled evily.

"Oh child. You can't even begin to understand what I have in store for you all."

Kara charged at her and was able to knock her off balance though she regained her sense quickly.

"You little!"

Somehow between the tithing they ended back at the church and Kara had managed to get a leg up on the woman by using her sonic clap which inadvertently brought down everyone in the vicinity. And once everyone recovered she then used all of what strength she had left to get a swift kick to the woman's gut which seemed to take her down for good. And it also knocked off her helmet. It was Kara. Or Nazi Kara. They all stared. The man with the arrows seemed pretty concerned (scared even) for her afterwards. He grabbed her and they all disappeared.

"What the hell?!"

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Lena decided to go to Kara's apartment and see if she was there.

She thought something strange was up because there's been reports of Nazis (or people in Nazi uniform) walking the streets of major cities around the world. It was all beginning to look suspicious. Especially with the absence of so many heroes.

She knocked on Kara's door and got no answer.

She stood on her toes and felt around the top of the door for the spare key she knew was on top.

Opening the door she saw that the apartment was dark and turning on the light it seemed no one had been there for days.

Weird, she thought.

She saw something on the otherwise clean and spotless counters and went to pick it up.

"You are cordially invited to the upcoming nuptials of Bartholomew Henry Barry Allen and Iris Ann Russell West!"

What's this? She thought? She saw the address and had a feeling this may be where everyone had disappeared to. She just had to figure out where they had all gone because that address didn't exactly exist on planet Earth. Unless... she picked up the phone and called Winn on her speed dial.

"Winn? I need a favor."