After one bite of the ice cream, Korra's eyes lit up and she quickly shoveled in two more spoon fulls.

"Whoa there, you're gonna get brain freeze like that." Spider-man said.

"Oh...right." she said, "It's...really good."

Supergirl's cup was completely untouched next to her. Both she and Korra sat cross legged on the building's roof while Spider-man sat on his haunches with his feet sticking him to the wall.

"Lets, uh, start out by getting names out of the way. I'm Spider-man." he waited on either of the girls to speak up next, but once they caught each others eyes they stared one another down in silence. "So this is going well." Spider-man continued after a few moments. "Guess we should get down to business. What were you doing right before you ended up here?"

"Where exactly is here?" Korra asked.

"What, do the Empire State and Chrysler buildings not give it away?" Spider-man asked.

She stared at him with an eyebrow raised in confusion. Spider-man looked over his shoulder to double check they had a good view of the city skyline.

"I-it's New York. We're in New York." he said.

"Oh...how new is it?" Korra asked.

"What? Are you telling me there's no New York where you come from?" he asked.

"No. And I'm pretty sure there's not an old York either." she said.

"Hm. Well what about you?" he asked Supergirl. "Is there a New York where you come from?"

"Yes, but I was in Metropolis." she said.

"Which one?" Spider-man asked.

"What? There's only one city of Metropolis." Supergirl said.

"You come from a city that's just another word for 'big city'?" Spider-man asked. He turned to Korra, "And what, are you from the city of Townsville or something?"

"No, I was born in the South Pole, but I was in Republic City before I ended up here somehow." she said.

"...what?"

"Ugh, this isn't getting us anywhere!" Supergirl said.

"Right, yeah. Just gonna put a pin in that 'South Pole' thing for later, but back to the question. What were you two doing before you ended up here?" he asked.

"Nothing." Supergirl said, "I was just flying over the city when there was a bright light and I felt like I was falling through some sort of hole. When I could see again I was in the middle of the street with my powers on the fritz."

"I had the same thing happen after I got done with a round of training." Korra said.

"Well...if you don't know about New York. And you're from a big city that I've never heard of. Metropolis is a big city, right?" Spider-man asked.

"Yeah, one of the biggest in the country." Supergirl said.

"Hm, this sound like inter-dimensional shenanigans."

"What?" Korra asked.

Spider-man hopped off the wall and crouched at the edge of the roof to look out over the street below. "If you two don't know each other...Why would someone bring two people from two different dimensions, and drop them in the middle of New York? Well to get them to fight obviously. But I put an end to that way too easy if that's the case."

"Hold on, you've completely lost me." Korra said. "What are dimensions?"

"Different versions of reality." Supergirl stood.

"Um...still not making a lot of sense." Korra said.

"It's like this. Have you ever wondered what would have happened if you did or didn't do something?" Spider-man asked.

Korra's shoulders dropped and she looked down at the roof. "All the time."

This sudden change in body language made him curious, but he decided to only take on one issue at a time. "Well, that's basically a dimension, or universe. For every decision you, or anyone has ever made that has any impact on the world whatsoever, there is a different version of the Earth, making an infinite number of realities."

"What? That's ridiculous." Korra said, "You're saying there's a different Earth made every time I to skip breakfast?"

"Mind blowing, yes?" Spider-man said. "That would explain why neither of you recognize me...or why you did and still punched me. Have either of you heard of Spider-man?"

They shook their heads.

"And it would also explain why I've never heard of..." he pointed with both hands at Supergirl.

"I'm Kara-Zor-El. But people call me Supergirl." she said.

"And also..." he looked to Korra.

"I'm Avatar Korra." she said.

"Look at that, we're bonding." Spider-man said. "Now the next step may be to figure out why you were brought here. Um...are either of you your Earth's greatest hero and-slash-or champion?"

"Yes. On my..." Korra exhaled, not sure if she couldn't believe it, or just couldn't accept it. "On my...world...the Avatar is the only one that can control all four elements. I'm the bridge between the spirit world and it's my job to keep the world in balance."

"I'm not my world's..." her eyes dropped and a strange pain crossed her face, "My 'Earth's' greatest hero." Supergirl said, "But I am his cousin. We have the same powers."

"Well then that's gotta be it." Spider-man said. "I was the most recent guy to save my whole world, so whoever's behind all this has thrown us together for some reason."

"Like what?" asked Supergirl.

"I dunno. Some challenge we couldn't face individually?" he said. "Or maybe some sort of...I-I don't know. I don't have much experience with alternate dimensions."

"Much?" Supergirl repeated, "But you do have some?"

"Only one." Spider-man said, "It was pretty similar to this one...except I was dead."

"Whoa." Korra said. Both of the girl's eyes widened slightly. "That must have been awful."

"Eh, not really." Spider-man said, "I died doing something awesome and heroic, sooo...all cool I guess."

Suddenly Supergirl stood and spun. "Who are those people coming for us?!" she demanded.

"What? Oh, you can hear the Quinjet." he said as the plane emerged from a behind a building several blocks away. "Those are the Avengers. Their my friends...sorta. Their this world's biggest and best heroes and the best chance we have of figuring out how exactly you got here."

The jet slowed down dramatically as it circled the building before hovering over top and slowly descending. Iron Man, Captain America, She-Hulk, and Wolverine filed out the side door.

"Spider-man, we-" Captain America held up his hand to hold up the others when he noticed Supergirl's stance. Fists balled and knees bent, she was ready for a fight. Spider-man followed the captain's gaze.

"Hey, it's alright. These guys are with me." he said.

"So?" Supergirl asked.

"So they're the good guys." Spider-man said, "You can trust them."

Korra was on Spidey's right. She tried to look less threatening, but she was just as prepared for a fight.

"I don't trust very easy these days." Supergirl said.

"Spider-man, you care to fill us in a little more?" Captain America said.

"Uh, they're from different dimensions." Spider-man said.

"Are we evil Avengers where they're from?" She-Hulk asked.

"No, you're not Avengers at all. They have no idea who any of you are." Spider-man said.

"Hate when that happens." Iron Man said, "I've worked very had to have a reputation that precedes me."

Supergirl's posture remained tense.

"Kara, these guys are the best way we're going to figure out whats happening." Spider-man said.

She stayed tense, debating on what to do next as she stared down the Avengers.

"Pfft. Let's get this over with." Korra said, "I want to get back to my 'world'," she said with finger quotes, "as fast as I can." she walked through the Avengers toward the Quinjet. Slowly, Supergirl loosened up and followed.

"Sorry we got off on the wrong foot." Captain America walked beside her. "I'm Steve Rogers, but I also go by Captain America. And you are?"

Supergirl didn't answer immediately, so Spider-man did. "This is Kara, and that's Korra."

"Ah, Kara and Korra. Are you two-"

"No, no prior relation." Spider-man said.

"Well, if you guys can handle things, I'm going to stay and get some readings." Iron man said. "I'll let Reed and Pym know what I find."

"Alright, lets get moving then." Captain America said, "To Avenger's Tower."