A Buffy the Vampire Slayer Crossover with Legends of Tomorrow and the greater Arrowverse.

A/N: This was written for the Twisting the Hellmouth 20th Anniversary Challenge as well as the 2017 Challenge. I may be turning this into a brand new fic of it's own depending on reader reaction. Let me know what you guys think of this.

Good? Bad? Ugly?

For as long as I can remember, I've been pretty unremarkable.

Unassuming, average in every way, the token normal teammate.

I wish I could say I was the caped crusader fighting evil, shoulder

to shoulder with my merry band of super friends, but that would

imply a level of heroism I've never quite been able to achieve.

Even now, in a time and place where I find myself surrounded by

a different group of super people who fight evils the likes never

seen on a Hellmouth, I am still very not special. No special training

that allows me to kill a man with a spork, or special gadgets that

allow me to do all sorts of cool stuff like shrink or light things on fire.

One might think that a team that has taken on the likes of an evil

immortal and a man so fast, he can literally run back and forth through

time, wouldn't have a place for me within this strange, yet lovable

and enduring ragtag bunch of misfits traipsing through time and

space, righting that which was made wrong by a new threat to the very

fabric of time itself, one born of magic, something they have little experience with.

That's where I come in, a Watcher fighting the forces of evil in ways

no one could have ever have predicted. Still, even doing what I do now,

like the rest of these guys, I'm no hero, so don't call me that… I'm a Legend!

Sunnydale Crater, March 10th 2017

Two people were looking out over the water, a strange, blinking device between them, when a flash of light lit up the sky. They looked up and saw a green portal open up and expelled a small, futuristic looking, spaceship.

Their eyes met as the craft touched down and they smiled at each other. They turned their attention back to the ship that had landed nearby, it's loading ramp facing them. The two women were nearly giddy with anticipation as they made their way towards it as the ramp opened up slowly.

It was startling how young the young pilot looked. While the blonde and the red head had visibly aged 20 years since the day they'd met, their Xander shaped best friend looked as if he'd aged only half that, which he had, given his new line of work. While it had literally been years since they'd seen him, they couldn't quite fathom what it had been like for him.

"Hey," he greeted them with a warm smile.

As if that was the signal that the two women had been waiting for, the two ran and lunged at the rugged pilot. "Xander!"

"I guess I've been gone a while, huh," he stated, smiling, holding both women, who were now several years older than he was, tightly.

"Too long, Xand, too long," Buffy said fondly, looking up into his eyes, the one he'd lost roughly 13 years prior having somehow been restored by the time traveling people who'd taken her Xander shaped friend on a journey to fight some ancient evil that was somehow manipulating time to suit his own ends and bring about his own return.

"So what's the what?" Xander asked. "We were just finishing up this mission a couple hundred years back in Prague when we picked up on your beacon. Considering where we are, I decided to come on ahead and scout the danger ahead of time before sending for the rest of the crew."

"No evil badness, not here at least and nothing that can't be taken care of without us, though we do have our phones on just in case," Willow replied sheepishly as she waved her smartphone at him. "It's just… Well… We wanted to see you."

Xander looked at them in surprise.

"It might not have been all that long ago for you since you saw us last, but it's been a while for us," Buffy added as she looked at her watch. "In about an hour, is the 20 year anniversary of The Harvest and the anniversary of us being friends and we wanted to celebrate this with you."

"I… As much as I should probably yell at you for setting off your time beacon in a non-emergency situation, this means a lot to me that you guys would do something like this for me," Xander replied.

"After you left, we kinda realized how much we took you for granted," Willow stated.

Xander shrugged. "We were all busy and each had our own duties. Trust me, for all my reasons for joining up with The Legends, because I was feeling neglected was definitely not one of them. Finding out after I came on board that they could fix my eye was a nice bonus, not to mention all the extra training and experience I'm getting. I haven't been with the Legends for long, but the stuff I've seen since joining up with them is… Wow!"

"Being able to see all that history as it's being made… I am so insanely jealous of you," Willow admitted.

Xander smirked. "Remind me to tell you about our trip to future where I apparently carried on The Legend's time honored tradition of starting a bar fight because this green nerd with a huge superiority complex couldn't stop being a dick."

Willow sighed in disappoint. "All the things you could do while traveling in time and you get involved in a bar fight."

"I did kinda feel bad about it afterwards until I found out that aside from the usual suspects that you'd expect in the group to be involved in bar fights, both Doc Palmer and Doc Stein each started one in 1942 Nazi Germany and in the Old West. So, apparently, I'm in good company."

Both of the women looked shocked at the declaration. Buffy was the one who spoke up. "The old guy started a bar fight!?"

"Something about hustling some nameless outlaw in poker. And would probably have started another one if I had't punched the greenie weanie first, with the way he was talking down to everyone," Xander explained with a shrug.

Buffy grinned. "So, didja win?"

Willow just looked exasperated at her two best friends.

"If you're asking if I put down the not-so-jolly green genius… I did. Unfortunately, his team of super powered friends got involved and we got curb-stomped after that," Xander replied. "Say what you want about us Legends, but team work is definitely not our forte. Now, if you ladies can give me a minute, I need to let Rip and Sara know not to send anyone after me." He then lifted his watch to his wrist. "Waverider, this is Paladin, false alarm..."

"Everything was covered before hand, so we gotcha covered, Xander," Sara replied. Xander could almost hear the smirking expression she was bound to be wearing on her face.

"Thanks, Sara. Let me know when you guys end up so I can meet up with you guys later," Xander acknowledged.

"Will do," Sara responded. "Waverider, out!"

Xander chuckled and smiled fondly. "You two really are some of the best friends a guy could ask for. So, not that I don't appreciate spending time with just the two of you, but where is everyone else?"

Buffy and Willow's smiled faltered.

All levity left Xander as he looked at two of his favorite girls in concern. "What happened?"

"First of all, Dawn's all right," Buffy stated. "We invited her along, but she insisted that the three of us catch up first."

Willow offered a comforting smile to her long time best male friend. "Kennedy's fine too. She volunteered to cover Buffy's duties while you're here so we could all spend some time together. Though she would appreciate if we popped in and said 'hi'."

Xander took in what they had told him, seemingly deep in thought. "Not a problem. Giles? Faith?"

Willow and Buffy looked at each other uneasily and Xander felt as if lead had been poured directly into his stomach and his own discomfort intensified ten fold.

"Giles hasn't been well," Buffy said carefully.

"Define 'not well'," Xander ordered tersely. "Because the way you're dancing around the subject makes me think that him being 'under the weather' is a gross understatement."

"W-We're not sure what's wrong with him," Willow admitted. "Whatever it is, is steadily getting worse, but he has good and bad days. Even on good days, any form of traveling can take a bit out of him though."

"I-is..." Xander couldn't bring himself to ask.

"W-we think so," Buffy answered, just as saddened as he was, if not more so.

Xander felt an immense burden of guilt. "W-why didn't you guys tell me sooner? I could help. Even if there's nothing on the Waverider that could do anything for him, I have might have access to resources and books that even you guys don't."

Both girls looked deeply ashamed and couldn't look him in the eye for fear of seeing him disappointed in them.

"We… We thought we'd have figured it out and have him cured by now," Willow admitted. "Pl-plus, y-you're Mr. Time Traveler now… With all these adventures and responsibilities and stuff. We didn't want to bother you with something we should be able to handle ourselves!"

Xander looked at Willow and Buffy in shock, never guessing that they'd feel useless when comparing themselves to him. It was a surreal experience for him to think that they had seemingly switched places since the night that he had mentally dubbed 'Night of the Zeppo'; when he'd battled a zombie street gang, ensuring that Jack O'Toole's plan to blow-up the school didn't interfere with his friend's night of world savage; not to mention getting deflowered by Faith, which was still a personal highlight for him. "Guys… I-I can't guarantee that I'll always be there to help and that even when I can, that I'll actually be able to do anything but… Something like this… The rest of existence be damned… I want- need- to be kept in the loop, so I can at least try. I mean… I-it's GILES!"

"B-But what if… What if he's SUPPOSED to die…?" Willow whispered.

"First thing you learn about time travel, is that time WANTS to happen. Time will preserve itself and maintain the status quo. It's only when the change is EXTREMELY big that an aberration happens," Xander explained.

"And if saving Giles creates one of those aboriginal thingies?" Buffy asked hesitantly.

Xander pinched the bridge of his nose. "Unless the aberration caused by saving someone I consider family resulted in an end of the world event, I could give a shit less. Changing the timeline, especially for personal gain, might be wrong, but I consider not saving someone when I had the ability to do so even more wrong."

"We wouldn't want you to get in trouble with the others," Willow interjected.

Xander shrugged. "I'd consider it worth it. Besides, exceptions have been made on a case by case basis."

Neither Buffy nor Willow looked like they agreed with him, but considering the person involved, they didn't want to disagree with him either.

"So… Faith?" Xander asked, changing the subject.

It was Willow who bit the bullet this time. "Sh-She's… She's dead."

Xander felt as if he'd been hit in the chest with a sledge hammer. "H-How?"

"We don't know the exact details of what happened," Buffy answered. "She mentioned she was investigating something, but didn't tell anybody about what she'd found or where she was going or why. What we do know is that she was in a building that exploded."

"We wouldn't have even known she was there except for the fact that her axe was found on the scene," Willow added. "Her body was burnt beyond all recognition, magical and mundane."

Xander swayed unsteadily and swallowed heavily. "Sh-she's gone…?"

Willow and Buffy both shared a look of concern. While they had expected him to take Faith's death hard, they hadn't expected such an extreme reaction.

"Where?" Xander asked coldly.

"Xand?"

"Where did she die?"