It was during the monthly rescue mission that it happened. This time it was Stiles they had to save, after the warlock had been captured by a group of werewolves who thought they'd gain power and territory by stealing another pack's magic user. It obviously didn't end well for them. Scott, Erica, Allison and Lydia had found Stiles and were heading back to the rest of the pack. Stiles hung injured and a little bored in Scott's arms but mostly okay despite having been missing for a week. Suddenly Erica turned to Scott and held out her arms saying, "Let me carry him."

"What? No!" Scott looked a mix between amused and indignant at the demand and turned a little so his shoulder was facing Erica as opposed to his chest.

"Oh come on," she growled stomping her foot. "I'm Batgirl, I should get to carry Batman."

"I thought I was Batman." Scott pouted tightening his grip on Stiles.

"Dude you're Robin today, duh." Stiles chimed in looking delighted by the geekiness of the conversation.

Scott frowned at him. "But wouldn't you be Robin since he's always getting kidnapped?"

"Batman can get kidnapped too!"

"Men." Lydia sighed.

"Oh!" Erica looked like she'd just reached some sort of epic conclusion and she waved one of her perfect fingers in Scott's face. "You're Superman!"

The taller werewolf seemed to consider this before nodding. "Okay that makes sense. But who does that make you, are you still Catwoman?"

"Nope, Black Widow." She said seriously and, if you looked closely, a bit mischievously. Scott and Stiles both sputtered indignantly even as Allison hooked a hand around Scott's arm to get them all walking.

"What the hell Erica," Stiles moaned, "Black Widow's Marvel not DC."

"Fine." She rolled her eyes. "Then Scott can be Captain America and you can be Hawkeye."

"Hold on a second." Allison cut in. "Shouldnt I be Hawkeye?" All three of them looked at her and then nodded. "Okay so how about Stiles can be Ironman?"

Stiles pumped his fist into the air and let out a triumphant whoop. "Sweet! Marvel or DC I'm still a sexy billionaire!"

"Who would be the Hulk?" Scott asked sounding contrite.

Erica and Allison chimed in at the same time, "Derek."

"I always thought he seemed more like a Wolverine myself." Stiles said making slashing motions in the air. "With the claws and the fangs and the stalking." The rest of the group stared at the ceiling for a moment before their jaws dropped.

"Jesus he's right." Erica sounded awed.

"Okay but we still don't have a Hulk." Scott was beginning to sound seriously distressed by this fact. But he'd always loved Bruce Banner.

Erica rubber her chin contemplatively. "How about Boyd?" She asked after a moment. "He's got the 'kind and quiet until provoked' thing going on."

"It is law!" Stiles declared shooting his fist up into the air. He winced as the motion jostled his ribs and Lydia glared at him, grabbing his arm and gently laying it across his stomach.

"Stop that." He grinned at her.

"Yes my beautiful, perfect goddess." The praise seemed to satisfy her because she placed a quick kiss to the crown of his head and kept walking. "So who's Isaac?" He tilted his head back to look at Erica. It was clear that they were all getting way to into his conversation.

They went quiet, all of them thinking. It was Allison who spoke up first. "Spiderman?"

Scott frowned. "Okay but why Spiderman?"

"Because he's adorable?" She said like it was the most obvious thing in the world. To be fair it did make a lot of sense. Spiderman was adorable, Isaac was adorable, it was only logical that they'd all reach the same conclusion eventually. "Now what about Jackson?"

"Hold up I've thought about this." Stiles grinned from Scott's arms looking all too excited. "Jackson is The Lizard!"

Erica rolled her eyes. "Because he used to turn into a giant lizard?" She guessed.

"That," Stiles conceded, "and he's evil."

"Jackson's not evil Stiles." Lydia sighed. "You've really got to stop telling people that."

"Yeah," Scott agreed. "He's only evil like, half the time."

"Just like The Lizard." Stiles said slowly.

"Thats good enough for me." Erica said clapping her hands together.

"And I think we all agree that Peter is Loki." Scott drawled with a wicked smile.

"Creepy Uncle Peter?" Stiles said. "Hell yeah he is."

"Oh, we forgot about Thor." Erica suddenly realized. "I changed my mind I want to be Thor. His hair is perfect."

"What?" Stiles pouted at her. "But you make such a good Black Widow."

"Weeell," Allison cut in her eyes darting between her four pack members. "If Erica doesn't want to be Black Widow then I think Lydia should be."

Lydia frowned at her. "I don't want to be a part of thi-"

"No wait that's perfect." Stiles cut her off and she glared at him.

"Injured or not if you ever interrupt me a again I will end you." She said with a pretty curl to her lips.

Stiles gulped but looked at Scott. "See? Perfect."

Laughing Scott nodded. "Yeah, Lydia is definitely Black Widow."

And thus the beginning of the code names.