Disclaimer: I own nothing you recognise; you know the drill.

Feedback: Always appreciated.

AN: Timeline-wise, for Barry and the Legends this occurs shortly after 'Elseworlds' and 'Legends of To-Meow-Meow', before their current enemy's efforts began to define their actions and made it impractical for them to be doing anything else.

AN 2: For the record, it will swiftly become obvious that this is technically also a 'Supergirl' crossover, but I chose to categorise it as a Flash/Legends crossover to keep things simpler. I also include a few elements from the comics that haven't appeared directly in the show yet, but I trust you'll enjoy the results anyway.

The Angel of Fire

When the idea first came to him, Barry had no idea why he hadn't thought of doing something like this earlier.

He appreciated that he might have just been put off by the fact that he'd failed to find any record of himself, Caitlin, Cisco or Harrison Wells back on Earth-38 during his original visit, but the fact that he'd never even bothered to look for the Danvers family or any of the counterparts of the people he'd met during that trip to another Earth suddenly bothered him. Barry acknowledged that he'd never had a particular reason to do that kind of research, but after encountering Alex Danvers and Jimmy Olsen's counterparts in Doctor Deegan's altered reality, he found himself unable to shake the thought out of his mind.

What are they like over here when reality isn't being manipulated by a mad psychiatrist with delusions of grandeur?

With Cicada still apparently 'licking his wounds' after Caitlin/Killer Frost was confirmed to be immune to his dagger's power-negating abilities, Iris doing some research with Ralph and Sherloque, and Caitlin and Cisco working on treating Cisco's injuries, Barry had decided to indulge his curiosity and spent some time trying to find out about the lives of Alex Danvers and James Olsen in his universe. After crossing off a range of candidates who either didn't live in America or were just too old or young to fit the right criteria, Barry determined that Olsen was working as a news photographer in New York, while Alex was a police officer in the small town of Leesburg, some distance down the coast from Central and Starling, apparently working under her father Fred (which was definitely different from their home reality; he was pretty sure Kara had mentioned that her Earth father's name was Jeremiah and he was a scientist).

Once he had found the individuals he was looking for, Barry left a message to assure Iris and the rest of the team that he'd be available if anything urgent came up regarding Cicada before he ran to New York to take a look at Olsen. After he found the office building where Olsen worked, Barry had quickly run through the office before he found the dark-skinned young man sitting in a briefing room in the newspaper offices casually talking with his co-workers. The man in question looked more relaxed than the version Barry had met on Earth-38, which Barry could only attribute to the fact that this version of Olsen had never been in the kind of dangerous situations that the other Olsen had evidently grown used to, living in a world where alien attacks were an almost regular event and he was a close friend to one of humanity's greatest heroes.

With his curiosity satisfied in that regard, and Olsen unaware that he'd ever been there, Barry then ran from New York to Leesburg, a longer trip that was only delayed by the need to look up the route; Leesburg was such a small town it seemed like the kind of place you could only find if you were already aware of it or actively looking for it. Eventually he made his way to the outskirts, but his plans underwent an unexpected shift when he ran past a particularly familiar face in the streets.

"Sara?" Barry said, as he quickly came to a halt in front of the woman he'd spent so comparatively little time with despite her close relationship to his closest heroic friend, his confusion only increasing when he recognised her companion. "Ray? What are you doing here?"

"Following up a lead on a supernatural fugitive," Ray Palmer replied as he looked curiously at Barry, even as the three moved off the street to stand in a small alley where they'd be less likely to be spotted by any passers-by. "What are you doing here? I mean, I know this is your time period, but it's a bit out of your area, isn't it?"

"Just… checking something out," Barry shrugged, quickly taking in their clothes. In contrast to the 'fighting attire' he was used to seeing them in, Sara and Ray were each wearing smart suits in a formal style that put him in mind of Joe or other detectives when they were on a case. Considering what he knew about their current mission, Barry wondered what they were doing in the present, but decided not to feel hurt that they hadn't asked him or Oliver for help; like all of his masked colleagues, the Legends preferred to handle things themselves unless they had to get help.

"Checking something out?" Ray repeated, looking at him in confusion. "You're all the way out here-?"

"It's just a personal matter I wanted to satisfy my curiosity about; nothing dangerous," Barry assured them. It wasn't as though he was ashamed of his decision to look up the alternates of his Earth-38 associates, but he just didn't see any point in telling everyone else about it. "But on that topic, what are you doing here?"

"To be sure, you've heard about the supernatural fugitives we're tracking, right?" Ray asked.

"Yeah…" Barry nodded, mind quickly going over what he'd heard about that particular situation; he wasn't as close to the remaining Legends as he could be, particularly after Professor Stein's death, but he still tried to keep up with their problems even if he had his own threats to deal with. "Something about… some kind of supernatural prison basically had a break-out, right?"

"Pretty much," Sara nodded at him. "Anyway, we detected a particularly potent supernatural energy lead in this area, and traced it to reports of… well, it seems like there's some kind of cult operating here." The former assassin looked at Barry curiously. "You seriously didn't know about that?"

"Uh… to be honest, I didn't really look into this place's local history in any real depth," Barry shrugged, deciding he might as well give them something. "I just wanted to check on Alex's alternate-"

"Alex?" Sara and Ray repeated in surprise.

"As in Alex Danvers?" Sara asked, looking at Barry with a new intensity. "Her counterpart lives here?"

"Yeah…" Barry nodded uncertainly.

"You mean this isn't just a coincidence?" Ray asked, reaching into his jacket to pass Barry a piece of paper. Taking the paper from Ray, Barry was initially just curious to see that it was a fairly standard amateur 'Missing' poster, but his eyes widened significantly when he took in the name.

Linda Danvers.

When he saw the photograph that took up the centre of the poster, Barry almost couldn't believe what he was looking at. The face in the picture wasn't exactly Alex Danvers, as it was rounder and struck him as somewhat softer, as well as the brown hair being longer than the DEO agent's usual style, but the resemblance was still clear to anyone who'd met Alex Danvers.

Alex has a sister? Barry wondered as he stared at the poster in surprise. A biological sister?

"You think-?" he began.

"I thought it was just a coincidence at first, but what are the odds of her not being related to Alex's doppelganger now?" Sara nodded firmly.

"Point," Barry conceded. "So this girl's been missing for the last few days?"

"And since it's the last big thing to happen in this town, we think it's connected to… whatever's here," Ray nodded. "We were going to try and talk to the family to get more details-"

"I'm in."

"You're 'in'?" Sara looked pointedly at Barry. "This is our problem-"

"This is Alex's problem," Barry cut Sara off. "I get that she isn't going to be the Alex who came to the wedding, but this Alex… she helped Kara during the reality reset; I get that she probably won't remember it now, but if I can help her somehow it's the least I can do."

"Reality reset?" Ray asked.

"Long and freaky story that we probably don't have the time for," Barry replied, still unsure how to feel about how he'd spent the last few days with Oliver's skills rather than his own (a part of him was still wondering how he'd do with a bow and arrow now that he had the memory of those few days even if he didn't have the training-enforced reflexes any more). "The point is, I'm here to check on Alex and I want to help you help her; what can I do?"