I know I should be working on one of my other stories right now, but this has been half written on my computer for the past month and a half and it's been bugging me, so I thought I'd at least start it. Not sure when I'll update again, but I hope you guys enjoy it.

This first chapter will have some similarities to the beginning of Crisis on Earth-X, but the rest will be remarkably different.

Earth-66, The Playground

Afternoon

There were times where he loved Natasha Romanoff, Steve Rogers thought with a sigh. This was not one of those times.

"Nat, T'Challa offered to pay for everything as a wedding gift, and Cait and I accepted Rhodey's offer to use the tower as a venue. I'm pretty sure we've made all the decisions we need to make for the wedding," Steve said tiredly as Natasha followed him down the hall on his way to his office for a video chat with Rhodey.

"Not yet. The Caters need a final count and not all the guests have RSVP'd," Natasha said and Steve frowned.

"Who hasn't RSVP'd?"

Earth-1, Star City

Same time

In a warehouse, gunshots went off as the Green Arrow and White Canary (now wearing a mask curtesy of Cisco Ramon), fought off a bunch of gunmen with ease.

"So you didn't check yes to Steve and Caitlin's wedding?" Sara asked as she whirled her baton, striking one of the gunmen.

"Now is not really the time," Oliver muttered, firing an arrow and getting one of the gunmen in the shoulder.

"I'll take that as a 'no'," Sara said cheekily, striking another gunman. "Seriously, they need to know if we're going."

"Of course we're going Sara," Oliver said, whirling around and striking a gunman across the face before firing and getting another. "Baring another villain from my past showing up."

Earth-2, Star Labs

Same time

"And the report needs to be filled by tomorrow. And the progress of the light gun is slow. And-"

"Dad," Jesse interrupted Harry in exasperation. "I can handle things for a few days, trust me. You don't need to worry. But aren't you forgetting something?"

Harry looked confused until, with a laugh, Jesse gestured to towards his desk. He looked over and saw the RSVP form, still unchecked.

"I think Caitlin might kill you if you forgot to send that in," Jesse said amused.

"And if she didn't, Killer Frost would," Harry agreed, picking up a pen and checking off the yes box.

Markovia, Earth-1

Same time

Roy Harper, in his Arsenal suit, was firing an arrow as he faced off with a drug ring, their armed security defending the top brass, resulting in a fire fight. He and his partner, Ben Turner, were engaging the security team when a voice that most definitely did not belong on their comms system spoke up.

"Roy, we need to talk."

It was only Roy's disciplined training under Oliver that prevented him from losing his focus and getting shot at the sound of Thea's voice.

"Thea?" Roy asked, dodging a wave of bullets and returning fire. "How'd you get on this channel?"

Star City

Same time

"Lyla patched me through," Thea said from city hall, taking her ear away from her cell phone as she heard the sounds of gunfire. "Listen, we need to talk."

"Little busy right now Babe!" Roy shouted over the gunfire.

"Oh you're busting up a drug ring. It's not like you're taking on Mirakuru soldiers or the League of Assassins," Thea rolled her eyes.

Markovia

Same time

"If you were here, you might have a little more respect for the drug dealers' security. What do you want?" Roy shouted as he continued firing.

"Caitlin and Steve need to know if we're coming to the wedding," Thea said.

"Can you two do this later?" Turner complained as he sliced up a security guard.

"He's got a point," Roy noted as he fired, getting another guard.

"Are you coming with me or am I going alone?" Thea asked as Roy whirled around, pulling out a flechette and getting the last of the security guards.

"Yes Thea, I'm coming. On one condition," Roy said as he sighed. "Never call me while I'm at work again."

Multiverse section 66, The Benatar

Same time

Tony and Rocket were working on the engines when Quill walked in.

"Aren't you two done yet?" Quill complained.

"Unless you want the engines to blow after we talk off, cool your horses," Tony not said, not looking. "Since you're here, did you send the RSVP to Nat?"

"Sure," Quill said in an unconvincing voice.

"He forgot," Rocket chuckled.

"I did not!" Quill protested.

"So did you send it?" Tony asked and Quill was silent.

"Kind of," Quill said awkwardly.

"You forgot," Tony sighed.

"Yeah," Quill caved.

"Fine, I'll do it myself. But if there's no food or seats for us, it's your fault Flash Gordon," Tony said annoyed.

Central City, Earth-1

Same time

"Can't believe you forgot to RSVP us," Wanda said as Barry checked the yes box.

"Hey, so did Clint," Barry said defensively and she laughed. "Being private detectives and running our own agency is a lot harder than it looks."

"I'm sure," Wanda said amused, kissing her husband on the cheek. "So we drop off Freya at Joe's in the morning, then we'll meet up with everyone else at Clint and Laura's and we'll all head to Earth-66 together."

"Then a whole weekend of just a normal get together with our closest friends. Can't wait," Barry said, lightly kissing her.

Earth-66, New York

Night

In a large office in a large building, a red haired woman in her thirties was sitting at her desk when she got a phone call. She answered the phone with a bored look on her face.

"An opportunity presents itself. Captain America's wedding is in two days," a man said on the other end and she smiled darkly.

"Our invite must have been lost in the mail. I guess we'll have to make an impromptu appearance," she said with a dark laugh.