Title: Old Guard.

Author: Knife Hand

Feedback: Constructive feedback appreciated, flames unappreciated

Spoilers: After SG1 meets the Asguard but before Danny Ascends in SG1. Sometime around mid series 5 of Buffy.

Rating: R

Disclaimer: Do not own Buffy or SG1 or Highlander. I would buy them but I am broke.

Summary: When Thor comes to ask for help, Sam Carter must reveal a secret older than anyone in the SGC can possibly imagine. Things really get complex when Sam calls her Brother, Xander Harris, a resident of Sunnydale California and the best friend of the Slayer. The Old Guard come to fulfil promises while the current warriors gather for their friends.

"" denotes speech, ' ' denotes thought.

AN: Glory never came to Sunnydale, she brain sucked a stoner named Jay and became totally incoherent and lost interest in going home. No one notice a change in Jay, not even Silent Bob. Anya never came back, Joyce never got sick and Riley got his head ripped off by a demon in the battle of the Initiative at the end of Series 4. Also there is no Asguard called Heimdall, I have been informed that there is a Heimdall mentioned in the episode after Daniel Ascends, but for this fic, he is not Heimdall.

AN2: Unicorn, things will all be explained in due course. Firstly, Xander didn't grow up with Wills, something I forgot to put in the original AN, Secondly, how do you know whether they have a problem with revealing it and even if Sam and Xand's secret had ever been revealed before. Thirdly, Willow has no problem attacking first when she encounters what she thinks is a demon, and how do you know if she was casting an offensive or defensive spell? Xander covered her mouth just to be safe.

~~~~~~~~~~~

Thor left quickly, saying that there was a while before they would be needed and that he would let them know if there was any new information. Xander convinced General Hammond that questions about Sam, Janet and himself could wait, so Daniel started to explain about the Stargate Project.

"Let's see how much damage has been done." Xander had said.

Once Daniel finished, leaving Buffy totally confused and Willow running all the information through her razor sharp mind, there was a pregnant pause as the Scooby Gang come to terms with the new information.

"Xander? Not demons?" Buffy asked, genuinely confused.

"Not demons." Xander confirmed. "But some Aliens are evil, like the Wyrms."

"Wyrms?" Jack asked.

"Goa'uld, Sir." Sam clarified.

"Ah." Jack said, leaning back into his chair. "Snakeheads."

Then General Hammond had gotten them all to sign Non-Disclosure Agreements.

"Man, this is worse than homework." Buffy complained, getting a chuckle from the Scooby Gang.

After the meeting, SG1, except Sam, took the Scooby Gang, except Xander, for a tour of the facility, with Dr Jackson, Willow and Giles all talking animatedly. Xander, Sam and Janet had wandered off on their own to catch up. SG1 had shown the Scoobies around most of the complex, a lot of which was drab grey hallways, and were passing one of the training rooms on their way to search for Sam and Xander when they heard the clash of metal on metal. When they opened the door they saw something they never expected, well for SG1, two things they never expected. The second thing, for SG1, was to see Doc Frasier standing around doing nothing while someone was injured. The first thing was to see Xander and Sam in an all out sword battle, with blood running down their skin. Xander was dressed in a pair of slightly loose pants; however he was barefoot and bare-chested, with rivulets of blood running down his face and chest. Sam wore her field cargo pants and a small black tank top that Jack remembered well, also barefooted and with blood on her face and exposed stomach.

"MMMM, nummy." Dawn drooled as she watched Xander.

"Dawn!" Buffy said, however her eyes were on Xander.

"Seconded!" Willow said to Dawn's comment.

"Look at Carter." Daniel said.

"Whoa!" Jack said before going non-verbal.

"I'd take her home." Tara added, earning glances from SG1 and a smile from Willow.

Another bust of clashes brought everyone's attention back to the fight. In her right hand, Sam wielded a Chinese Longsword, its thin and fairly narrow blade both sharp and flexible, while in her left hand she held a Falchion, a short sword which had the heavy weight and cutting ability of an axe. Xander on the other hand wielded a two handed Middle Eastern Scimitar. Xander's large curved blade swept a Sam, only to be blocked by her Falchion. Janet motioned the new arrivals into the room to watch away from the fight. Sam took the offensive and Xander's large blade swung to defend. The Chinese Longsword almost glided through the air, the entire sword a graceful weapon, with its flexible tip performing slight by effective cutting motions, while the Falchion hammered through the air, relying on its sharp edge and heavy weight to shatter shields and turn swords.

Xander slid the Chinese Longsword away along the curved edge of his Scimitar; however he met force with force when facing the Falchion. Xander, noticing the observers out of the corner of his eye, jumped when Sam did a strait thrust with the Chinese Longsword, landing on one foot while balanced on the horizontal flat of the blade. Sam immediately swung her Falchion to take out the supporting leg, however by the time the heavy weapon arrived at its target, Xander had already back flipped off the blade. Sam took a step backwards and swung the thin blade around to rested the flat against her back, the tip resting between her shoulder blades, stilling the uncontrolled vibrations Xander's flamboyant move had caused.

"Show-off." Sam taunted.

"Wow." Buffy whispered.

"Indeed." Teal'c added.

Xander just smirked and twirled his Scimitar to either side of his body before taking the offensive again. The fight started up again, with the ringing of the swords colliding, and grunts either from exertion or pain. The sparring session finally ended with Xander's Scimitar at Sam's throat and Sam's Falchion at the side of his neck.

"And we have another tie. How many is that now?" Janet said.

"I gave up counting in the twelve hundreds." Xander said with a shrug.

"I got to four hundred and seventy five thousand, eight hundred and ninety six. That was around the time of Crécy."

"What's Crécy?" Buffy asked.

"The battle of Crécy, between King Edward III of England and King Philip VI of France was fought between the small villages of Crécy and Wadicourt near the beginning of the Hundred Years War. Saturday, August 26, 1346 to be exact. The English defeated an army approximately three times their own size." Giles lectured.

"Doc! I think you should send Carter to a shrink." Jack said.

"Why?" Janet said casually.

"Hello, she thinks she was alive in 1346."

"Jack. Sam and Alex raised me from when my parents died when I was two. Hell, Sam was there at my birth. Go check them out for injuries." Janet said.

The Scooby Gang crowded around Xander while SG1 closed in on Sam, checking for injuries. The trails of blood from the fight were still present, however when they were whipped away, all they revealed was smooth, healthy skin.

"Good Lord." Giles commented.

"WHAT THE FUCK!!!!" Buffy exclaimed

"It could be nanotechnology. No, they still a few years away from this level, plus he would be setting off all the metal detectors...." Willow began before running off into mumbling.

"I like her." Sam said smiling.

"Yeah, but that's what you said about Joan Darc, and you remember how that turned out." Xander replied.

"Hey, not my fault. And she got canonised." Sam replied.

"Yeah, a few hundred years after she was burned at the stake." Xander shot back.

"At least Joan was a good guy. You were drinking buddies with Temujen." Sam smirked.

"Um, who are they talking about?" Buffy said.

"I know that Joan Darc is Joan of Arc, where I believe Temujen is the birth name of Genghis Kahn." Daniel replied.

"Xander was drinking buddies with Genghis Kahn? Why am I not surprised?" Dawn said.

Janet silently led everyone except Sam and Xander out into the hallway.

"They'll be like that for hours, unless something comes and interrupts them." Janet said.

"One question. How is all that possible?" Jack asked.

"Which part?" Janet replied.

"Hundreds of years old, almost instant healing. Hell, even Slayer's don't heal that fast." Buffy said, then she realised her mistake. "Opps."

"Simple answer. They're Immortal." Janet said, continuing when she saw questions on the faces of both SG1 and the Scooby Gang. "They're totally human, except they can heal any wound and only die when they have their heads cut off."

Everyone either glared or stared dumbly at Janet.

"Oh for a distraction." She whispered.

*UNSCHEDUALED OFFWORLD ACTIVATION!* came a voice over the PA system.

"Thank you." Janet said, just as Sam and Xander emerged from the training room.

Everyone ran for the control room as fast as they could.

"Sir, it's SG8." The technician said.

"Open the Iris." General Hammond said. "Interesting uniform, Major."

Sam looked down and realised she was still in her sparing outfit, and so was Xander, who got looks from a female technician.

"I was sparing with my brother, Sir." Sam explained, just as SG8 came through the Gate.

"Welcome back SG8. Debrief immediately after your physicals." General Hammond said.

"Bobby?" Xander said before running down to the Gate Room.

"Bobby! How you bin, you old fart?" Xander said as he entered the room.

Major Robert Paulson looked up to see a familiar face.

"Raven! What the hell you doing here?" he asked.

"Visiting my sister." Xander said, motioning to Sam as she entered.

"Shit man, you're related to Carter?!? Does that mean I have to be extra polite to her?" Bobby asked cheekily.

"Hell no. I'm still pissed at her for not brining me in on this. How you been man?"

"Hell, I tried to get you in, but we couldn't find you. It's a wild ride."

"Sorry man, been out of the game. Figured you had to learn to look after yourself after I took five for you in Costa Rica."

"Yeah, Yeah. Ramirez, pass me the camcorder. Take a look at this." Paulson said.

The tape showed the team in the Gate Room, then the travel through the Gate. Robert fast forwarded through some general boring mission events, like lots of trees and the campsite, till he got to the interesting part.

"Sam! Come here." Xander called.

Sam rushed over and Paulson played the last bit again.

"Shit." Sam said.

"Agreed. We got to help them." Xander said.

"I got our stuff in storage. Janet! Help me get some stuff." Sam called.

On the screen was a small mountain village and a young man of Japanese descent running through the village shouting 'Oni' over and over again.

TBC.