(A/N: Don't start here! This is the fourth story of the ongoing Frozen/Marvel's Cinematic Universe crossover series. It begins with Cryomancy, and the easiest way to find that story is by going through my profile page. For the rest of you, sorry to keep you waiting. Had a new job in a Pizza shop. - TZ)

Upon first impression, Maria Hill's office at the Triskelion was clean, well lit, and organized. Maria liked order, and her desk reflected it, other than her computer, a single manilla folder was the only thing on it. There wasn't even a coffee cup.

Maria Hill began without preamble. "About eight weeks ago, hundreds, if not thousands, Chitauri descended on New York. While the Avengers, with help from SHIELD Agents and the NYPD managed to stop them, they left advanced arms and ammunition littered all over the city."

"We recovered a good deal of it," Maria continued. "Some of it fell into civilian hands. I'm sure you remember the pair that used Item 47 to rob banks. But the analysts have been running the numbers, and we think there's more of them out there. A lot more." She pushed the folder forward towards the agent sitting across from her. "A syndicate has been searching for people that may have found pieces and quietly acquiring them, paying top dollar."

The agent leaned forward, picking up the dossier, "Who? The five families?"

Maria shook her head. "We've people in their organizations, if it's them, we'd know. It could be some offshoot that we don't know about yet." She met his eyes. "That's why you're going in."

He frowned, opened up the folder, and scanned the first paper briefly. "And the introduction of... metahumans," he looked annoyed. "Is that what we're calling them? Metahumans? Aliens? Whatever. That makes it a SHIELD issue."

"That's right," Maria said. "And we need someone to go in, undercover, and break this madness apart before it takes a foothold."

The agent flipped through the other pages in the dossier,"I'm imagining a mob war, adding in toughs with superpowers," he said. "That... could tear the city apart."

"That is exactly what we're trying to prevent," Maria agreed.

"I'm just an average Joe," the Agent protested. "I don't have anything they'd be interested in."

"Certain of the Phase 2 prototypes are finished," Maria told him. "We've adapted a few of them for the person who takes this assignment. It should be exactly the kind of thing that will get their attention."

The agent digested this. "Alright, so now if they find out, they're interested. But I still don't have a way in, and I'm thinking robbing a bank is probably a little too high profile for drawing attention, not to mention a bad idea."

"We're pretty sure they're monitoring certain websites, such as AIM and MERC..."

"The Association of International Mercenaries and the More Economical Recruiting...whatever it was?" the Agent asked, breaking in. "They're still in business?"

"The website is based in a country where it's not actually illegal," Maria said. "But they're careful, they won't advertise people are working in the US. There's dark variations, though."

"Hm. So I list myself as a sociopath for hire and see what comes of it? I guess that works," the agent said, thinking about it. He frowned as Maria nodded. "Look, I don't like it. I have a wife and son, Maria. I want to be able to come back to them... how long will I be undercover?"

"The director says if nothing happens within three months, we'll pull you out."

"I.. I guess that means I'll be home in time before Michael starts football," he told her.

"We'll give you hazard pay for the full time, too. It'll give you a head start in paying for his college," Maria added.

The agent winced, they were hitting him where it hurts. He needed the money. SHIELD's paycheck were good... but he had big expenses coming up. As Maria just reminded him. "I... I..." it was probably his job if he refused it. "Alright. I'm in. Does the director want me to start immediately, or can I spend this weekend with my family?"

"Monday will be fine. It'll take time to procure the tech and to backstop your new identity."

Small favors. "Thank you, Ms. Hill."

Maria gave him one of her rare small smiles. "Thank you, Agent Payne."

Two months later

Elsa knocked on Anna's door, contemplating the reversal a hundred years caused. But it had been only a few months to Elsa, and maybe a few weeks to Anna. "Tony says we need to be early. Are you almost ready?" she called.

"Almost. Be out in a moment!" Anna called.

They'd gotten this down to a routine. The first thing Anna wanted to do after waking up (or sleeping in, Elsa would say), was practice sword fighting. It was the one link she had kept to her old life. There hadn't been many servants left after her father sent most of them away, but the Captain of the Guard had been one. And Anna had been very bored.

None of Elsa, Pepper, or Bruce (when he was around) were interested in practicing with her. Tony was interested once, but after Anna firmly displayed that she actually had skill in the area, he wasn't interested either. So he had Jarvis create a holographic training exercise. To Anna's delight, her targets resembled the Chitauri Elsa had fought in the battle of New York.

The rest of the morning, and some of the afternoon, was dedicated to the practicing of English, of learning about the 21st century, and of the major things that had happened between Arendelle and the invasion of New York. Anna was very good, in Elsa's opinion, at acting interested. But she'd hated tutors back in Arendelle, and she didn't take to Jarvis very much in this respect, either. The fact that he was some kind of artificial intelligence, on the other hand, she thought was incredible.

It was the evenings that Anna looked forward to, these were dedicated to more hands on activities, getting them out in the world. For example, they'd gone to a restaurant with Pepper. Another night it was an animated film with Bruce, and after he realized the girls were getting none of the jokes, to an arcade afterward. Elsa hadn't enjoyed that, it had been too loud for her, but Anna had liked it.

Tonight, they were going out with Tony to something else. He'd been evasive about exactly what, only that he thought Elsa would enjoy it.

"She coming?" asked Tony dryly.

The door came open and Anna came out, her hair rebraided, dressed in a light green shirt and darker pants.

They descended to the basement, Tony picking one of his many expensive sport cars. Luckily, in Elsa's opinion, there were three of them, so he was forced to take one of the four doors, instead of one of the truly insane two seat models.

Tony drove aggressively through the downtown streets, weaving through cars with reflexes born of piloting his own armor. Anna was enraptured, but Elsa thought she was going to be sick. Anna had already expressed her desire to learn to drive. Elsa had sworn that it would be with Ms. Potts, or perhaps Mr. Banner, to teach her, if anyone. They arrived at a multistory parking garage. Tony insisted on racing to the roof, slowing only to park.

"Where are we going, anyway, Mr. Stark?" Anna asked as they got out.

Tony pulled a large metal suitcase out of the car, looking around, sneaking in a glance at Elsa. "That way," he said, pointing to the elevators.

"Hey, that doesn't answer my question," Anna said as Elsa followed suit.

Tony glanced at the elevator buttons. "Street Level," he told Elsa.

A few more people came in as the elevator descended. They were too engrossed in their own conversation to realize who they were sharing their elevator with.

As they descended to the street, and began their trek toward what looked like a giant building, with a few more people joining their path. Elsa could hear the whispers of people who had figured out that Avengers were present, but no one had approached yet. She knew from experience it was a matter of time, though. Tony looked slightly uncomfortable. "Glad we beat the majority of the throng, at least. I mean, it IS opening night."

"Madison Square Garden," read Anna, pointing upward. "New York Rangers versus the Washington Capitals."

"A sporting event," said Elsa. She recognized Madison Square Garden at least, but she couldn't pull what type of sports were held here.

Tony reached into a pocket and pulled out three pieces of paper, and held them out. "Take these, Anna?" he asked. She eagerly did so. He then pointed at the door, and all three of them went in.

"Tickets, please," asked the gentlemen inside.

Anna blinked at him momentarily, then looked at the papers, and handed them over. "Thank you."

He held some sort of wand, and waved it in front of each of them. It beeped loudly when it reached Tony's suitcase. He looked up at him, narrowing his eyes for a moment then looking into Stark's face and realizing exactly who he was admitting. "Are you?" he stammered.

"Yes."

"And is that?"

"It is."

He pulled a Walkie-Talkie off his shoulder, spoke into for a moment, got a response, and put it back. "Do you have any identification?"

Tony rolled his eyes. "Really?" He pulled a small colorful magazine from his pocket, unfolded it, and held it beside his face. "Will this do?" he asked. Elsa glanced at it, "Iron Man and the Avengers, Defenders of the Earth," she read aloud.

"Oooh," said Anna, nudging her sister. "Do you think you're in that?"

The ticket taker turned to Elsa, looked shocked again, and waved them through.

Tony glanced at the magazine in his hand, chuckled, and folded it up again. Once past the ticket tackers, Tony made for a ramp listed "To: Signature Level Suites".

Once they'd arrived at what Tony called the box, and taken what were very nice seats, Tony pointed through the glass wall to what was clearly ice below. "So, have you had a chance to see Ice Hockey yet?"

Ice Hockey. An American sport and... that's all she knew. "No," Elsa admitted.

Anna had raced to the window, looking down to the ground below. The seats were still mostly empty, but fans had begun to filter in. "An ice rink?" she asked aloud.

"You'll see." He walked over to join Anna, looking down at the ice "Ice Hockey's one of those put the object in the basket sports," he shrugged. "In this case, puck and net, respectively. I don't care much for it, but Pepper insisted. We're going back to California soon, and she said this would be a good going away present."

Anna turned away from the glass, looking alarmed. "But, where would we stay, Mister Stark?"

"Oh, you can keep staying here. Banner is, after all," he waved his hand unconcernedly.

Elsa furrowed her brow. This wasn't quite like the Tony she'd lived with since the invasion. "Are you all right, Tony?" she thought back over the past few weeks. "Are you sleeping OK?"

Tony flinched before putting on his attitude again. "Yes. I'm sleeping fine."

Elsa was pretty sure that wasn't true, but she knew enough to know she didn't want to push him. She'd tell Ms. Potts.

While they were waiting for the game to start, Tony gave them some brief hockey lessons.

"How have you never tried this?" Anna asked Elsa. "You'd be great!"

Elsa rolled her eyes, "I don't have nearly the aggressiveness you think I do Anna," as one of the ones in a white shirt ran into one of the ones in a red shirt.

"But you don't even need the skates!"

"I suppose not," Elsa said dubiously.

Anna threw herself into the game, badgering Tony to explain the rules as best he could. Elsa watched the game more quietly, more interested in the skating and stick handling technical aspects than the aggressive part of the game itself.

They also had the chance to sample concession food. The cheeseburger she had a main course was nothing to be impressed with. Which wasn't to say she'd not had a good one, she shared Tony's opinion that the Whopper was the king of the cheeseburgers. But this wasn't a good one.

The fried dough called an "Elephant Ear", covered with powder sugar, on the other hand? She was going to have to force herself to join Anna's training in the morning.

The game wasn't particularly a nail biter, but the four to two Rangers win sent the home crowd happy, at least. Tony stalled for a while, afterward, giving the crowd a chance to mostly disperse before heading back to the car.

Traffic on the way home, however, was still moving slowly, especially for the late hour. Tony groused about being stuck behind some sort of opaque, heavy metal truck that he could not see around to pass.

As they waited, a bit ahead of them, came a loud bang!

"What was that?" asked Elsa, in the back seat, alarmed. "I can't see anything."

Anna, in the passenger seat, was straining to see around the other side of the steel truck. "I see smoke... a lot of it."

"Bang, black smoke. A car backfiring, probably," Tony said, rolling his eyes. "That's going to delay us even more."

The acrid smell of smoke began to waft into the car, and Tony turned up the fan to compensate. About thirty seconds of not moving later, there was the sound of a siren in the distance and coming closer. "Alright, maybe not," said Tony. "That's an ambulance."

"There!" pointed Elsa, spotting the ambulance coming down a side street to their left, panicked pedestrians hurrying out of the way.

"It's not slowing down!" cried Anna.

It hit about two vehicles in front of them, with a large crash echoed by the screams of the people on the sidewalks around them.