Note: I saw the first episode of Season 13 of DW and when I saw "The Flux" and heard of what its purpose is, it got me thinking that it almost sounds very familiar to the Anti-matter wave from the Crisis on Infinite Earths! Tell me I'm not the only one who noticed it. Anyways, enjoy!

Chapter: One

The Whoverse

"….Are you joking?" Yaz asked The Doctor to confirm what she just said about the universe being gone.

The Doctor turned to look at the two people, "Not joking, I'm trying to find an event called The Flux." She informed them, drawing her attention back to the console switching knobs and dials. "Karvanista seems to think it will overwhelm most of the Universe." She added walking around to the other side of the console.

"And you're gonna go looking for it?" Their newest visitor Dan asked. Unsure if he is involved.

The Doctor looked up, "We are." She said motioning to three of them. "Why don't I know about this? And who else does?" She asked mainly to herself rather than to her companions.

—XxXxX—

In the Arrowverse- Meanwhile in on the Waverider

The Heroes are back at it again. Teams; Supergirl, Arrow, Flash, and Legends. Teaming up to save the world once again, but this time it's not only the world that's at stake, but the multiverse as they have to deal with the anti-monitor and his wave that is coming through and wiping universes and Earth's in a blink of an eye.

The hero's were all aboard The Waverider discussing strategies and solutions on how to save the entire multiverse from being wiped out and defeat the anti-monitor.

"How can we fight something that we know nothing about. All we know is a name. So, how are we gonna save all the earths in the multiverse?" Kara Danvers aka Supergirl of Earth-38 asked.

The Flash leaned forward against the console they were surrounding. "We just have to work with what we got. So let's hear it. What do we know so far?" Barry asked as he went to a clear board and grabbed a marker.

But before anything could be said, a noise penetrated the room, a whooshing sound. They all looked around trying to find the source, "There." Iris called out pointing to the space in the middle of the room. They watched as a blue box appeared and then disappeared, fading in and out of existence before it solidified and landed with a knife echoing thump.

The hero's got into a fighting stance in case that someone in the box was unfriendly. The door opened and a woman with short blonde hair came stumbling out and noticed the group of heroes, "Great I'm just in time. Hiya, I'm the Doctor. Nice to meet ya." She greeted in a Yorkshire accent. Sara, taking charge of the situation, stepped up.

"How did you get here? Who are you?" She asked hoping to get answers. The Doctor smiled, "Simple. I'm here to help with the Flux." She said, getting confused looks.

Cisco looked baffled, "You mean the anti-matter wave?" He asked as the Doctor regarded the name for a few minutes.

"Maybe. Well, where I come from it's called the Flux. Wiping everything out. As to who I am, well I'm a Timelord, an alien from the planet Gallifrey and that…" she said pointing to the phone box, "…is my TARDIS. Stands for Time and Relative Dimension in Space. I can travel throughout space and time. Also, I'm not from this Universe. Any Questions?" She asked eagerly.

–XxXxX–

The group looked at the being known as The Doctor, "Wait, so you're from a Different Universe?" Barry asked, taking an interest in this woman. The Doctor nodded, "Yep. So, who or what are we up against?" She asked.

The Heroes all looked at each other and shrugged their shoulders, they did need all the help they could get so Sara sighed and turned back towards the Doctor. "Alright, Doctor. We do need all the help we can get. Welcome to the Team." She said, holding out her hand. The doctor smiled and shook it.

"Right, I'll ask again, who and what are we up against?" She asked as they all converged around the console once again, "He calls himself the Anti-Monitor…" Sara introduced as she brought up a holo-image of a bald man creature with armor, "... he sent out a wave called the Anti-Matter wave or as you call it in your Universe, The Flux to erase all of the Earths in existence from every known parts of the infinite Universes." Sarah summarized.

The Doctor nodded, "Well, who or whatever this guy is, we need to find a way to stop him. Because I can feel the Universes being destroyed." she said stunning the group once again.

Note: I Don't know if that's true about the Doctor feeling the effects of the "Wave" or the "Flux" destroying the Universes, but I added it anyway. Back to the story!

The group looked at the doctor, stunned, "Wait, you can feel when Universes are destroyed?" Cisco asked, eyes widened. The Timelord nodded. "I'm a Timelord. Responsible for all of Time and Space. This is no different." She said as she placed a hand on her head. "Everytime a Universe is destroyed, I get this….warning like a sting in my head." she explained putting her hand down.

"How is that possible?" Kara asked, crossing her arms, she doesn't fully yet trust this "Doctor" yet but she's interested in any information she can get out of the alien.

The Doctor shrugged her shoulders, "My species are telepathic. But, I don't go into people's heads unless I am in contact and/or I get permission." She told them as J'onn nodded his head.

"I can feel your telepathic abilities from here. I'm a Martian and we too can see into other people's minds." He spoke up as The Doctor smiled, "That's Great! We should get together and compare notes sometime" she replied excited to meet another telepathic being.

Barry sighed, "Right, can we please get back to the matter at hand?" he asked as The Doctor shook her head, "Oh mate, I got all the time in the Universe." She said with a smile confusing the hero's.

–XxXxX–

Parallel World (Pete's World)

Rose Tyler-Smith was standing beside the window and watched as the skies slowly turned red, when she woke up this morning, she had a bad feeling. A warning. She had a dream of a wave coming and destroying Earths. She can feel it happening. She knew that the warning was from BadWolf. She and the Meta-crisis Doctor discovered that she never aged. Because when she saved the Doctor by becoming BadWolf for the first time, it changed her.

That when she dies, she comes back to life.

It was 2020 and here she was, alone waiting for a being to appear because she also had a dream of someone appearing and taking her to meet a group of people, that it was her destiny. Everyone she loved, even her husband had died of old age. She was the only Tyler left.

She felt a presence along with a beam of light, "I know why you're here." Rose said, turning away from the window to look at her visitor and saw The Monitor.

The Monitor nodded, "Yes, Rose Tyler. The Universe needs the BadWolf." he told her Rose took a deep breath. "Let's go then. Yeah?" she asked and then they vanished in a flash of light.

End of story note: That's all I got for now. If I think of any more ideas, then I'll add it to the story. But for now, I'll just leave it where The Doctor meets the Heros. Thanks for reading.