Disclaimer: I don't own any of these characters or anything like that, except Kohl Sirk.
Thanks in advance for glancing in the direction of my story. I'm hoping for reviews.

Here's a new chapter! Bear with me, this one is a little long and kinda farfetched but I thought "Hey, it has to happen to SG-1 eventually!!!" So here's my take on IT! (You'll know what it is when you read the chapter.) And Thanks again to everyone who read's this and double thanks to those who also review. It's you guys who make writing worth while!!! Enjoy!

When a stranger is literally thrown through the Earth Stargate, SG-1 must discover who he is, why he claims to be part of SG-1 and how he opened the Iris.

Traveler: Truth

A short while later, Hammond and SG-1 were in the briefing room, eagerly awaiting the story Sirk would tell them. Sirk arrived a few minutes later, newly bandaged with a sling for his right arm, it seemed it wasn't healing as well as expected. Sirk entered the room with two armed and alert airmen who were dismissed by General Hammond and quickly left the room.
Sirk quickly scanned the room. Hammond sat at the head of the table, with Jack and Teal'c on one side and Sam and Daniel on the other. Sirk took his seat at the other end and sighed when he finally got comfortable. These chairs were somehow familiar to him. He closed his eyes and could barely reopen them when he was prompted by Hammond. He was exhausted, physically and mentally but he had to tell this story.
"I don't know where to begin..."
"How about at the beginning?" O'Neill quipped.
"Indeed." Added Teal'c.
Sirk smiled faintly, before he began.
"About two years from now there will be a mission everyone will regret. Everything goes wrong, starting with the dialling of the gate. SG- 1... your SG-1, is sent through on a mission to communicate with the people on the planet. However a Goa'uld force is waiting for the team. The contact goes smoothly before SG-1 realizes it's a setup. They manage to fight their way back to the gate, but just before they can dial home, they are flaked and become trapped. I'm not sure exactly what happened next, but when SG-1 finally got through the gate, they were one member short. Teal'c didn't make it. No one ever told me exactly what happened. It was a very emotional topic for everyone.
Anyway, about a month later, SG-1, with a replacement member discovered that Teal'c had been publicly executed as a shol'va. But the results of Teal'c death were highly unexpected. Jaffa everywhere began to question there Gods, and soon revolts were occurring under every God. It started with the lesser Gods then moved up to some of the most powerful ones. System Lord after System Lord fell at the hands of their own men. It all seemed too good to be true, and in the end, it was.
About two years after the revolts started, a new System Lord appeared, by the name of Thoth, lord of Darkness. It seemed he'd been waiting quietly on a secluded planet for the right chance to emerge. His forces were fiercely loyal and nothing swayed them. Soon, the Jaffa who had revolted were switching sides and joining Thoth's cause of domination. Later we discovered that Thoth was switching the Jaffa very easily. He had some strange ability to look into someone's eyes and change their soul, almost like brainwashing, only more thorough.
Well, about five years from now, Thoth is the only thing of concern. Every other System Lord is either wiped out or in hiding. That's when he starts focusing on the destruction of the Tar'ri. SG-1 gets wind of this and is sent to destroy the lead Ha'tak. Only when they arrive, they discovered Thoth himself is aboard. Inevitably, they are captured and before they can escape, Dr. Jackson and Sergeant Richardson are converted by Thoth's gaze. O'Neill and Carter get back to Earth, only after destroying the Ha'tak they knew Daniel was on. And thus SG-1 was knocked down to two members and decommissioned.
As it turned out, Thoth wasn't destroyed on his ship and without warning he attacked Earth only weeks after SG-1's sabotage attempt. The amount of Jaffa that were dropped onto Earth soil on Drop Day was unimaginable. They landed in every major city and the people were totally surprised. But even with all his calculating and preparing Thoth hadn't accounted for one thing, Human Will. We drove them back. Days of fighting turned into weeks and the weeks to a month before the last Jaffa fell. The Human race was devastated and wanted an answer, that's when the SGC was finally unveiled to the public, only now it was the SGDC, the Stargate Defence Command.
After our race fought its way back from extinction, some of our allies finally came to our aid, mainly the Asgaard and... another race you'll meet later. The Asgaard offered us an Intraplanetary Depression Field Generator. It let us disrupt subspace around our planet at a great enough distance that if any ship approached our solar system, their hyperdrive would become inactive and we would have a thirty minute warning before any attack. This would give us time to prepare the Orbital Defence Station, another gift, to intercept. However, Thoth still made some attacks from space, but we stood strong so he found a new front to attack us on.
His first attack through the Stargate, about six and a half years from now, was completely unexpected. He got through the Iris with a stolen GDO and the attack was swift and strong, causing devastating amounts of damage. However the attack was not strong enough to penetrate to the surface and we again pushed them back, but not without heavy casualties. General Hammond was killed and Colonel O'Neill was injured quite badly, his leg never healed right after that.
That was the first time I met Sam face to face. For about a year and a half, I'd been working as a guard on the inside of the SGDC. Since just before Dr. Jackson died. During the attack on the base I... saved Sam's life. Well, enough about that. Where was I? Oh yeah.
Colonel O'Neill was promoted to General and given full command over the SGDC because the president believed there was no other man who knew more about the Stargate. Major Carter was promoted to Colonel and given command of the newly recomissioned SG-1 in 2011. SG-1's missions were to attack Thoth's strongholds and prevent as many attacks on our base as we could. The team consisted of Colonel Carter, Major Sarah Kovitch, Russia's best soldier, Dr. Roy Ling, a Chinese linguist and I. Carter told me it was because I had skills they didn't teach in any academy. I used to laugh at that...
In 2012, Earth was in a constant state of turmoil. Person battled person for food and water, we had never really recovered from Drop Day. That's when the Omega Site was established. An offworld colony of our planet's best, with the best defences we had. Also that year, Thoth's men developed a new and deadly weapon, the Rizenikatu or the Rizer, as General O'Neill called them. These weapons were more then a step ahead of what they used previously, they were leaps and bounds ahead. Stronger then Staff weapons and the size of Zats. The real problem was the energy they used was compatible with the material the Stargate was made of. Therefore if the Rizers were fired at the gate they would charge it up. After it was charged, anyone who went through would have a nasty landing on the other side... if they survived the trip.
So Carter developed an enhancement to our GDOs. The enhancement was like a battery that would store some of the energy that was pumped into the gate. When our molecules were being put back together by the gate, the battery would activate, and absorb the extra energy. Then after a person was expelled from the gate, the energy would be let out as light and heat.
Another addition to our GDOs was the auto-opener Carter developed. There were some occasions when SG teams were offworld that our base would be compromised and the Jaffa would gain total control. Usually the base would be sealed off from the surface, so they couldn't escape, but they still caused a hell of a lot of damage. Any incoming SG team who didn't know the base was compromised would head through the gate thinking their GDO signal would open the Iris, only to... well you know what happens when the Iris is closed. So our little auto-opener would send a signal that would interface with the Iris itself, instead of the Control Room computers. That's also how we would retake the base and get to the Omega site. A permanent Iris was in place that could only be open with a select few auto-opening GDOs. That way, no Jaffa could get to our colony."
When the boy finished his story he hung his head and sighed loudly. Everyone else in the room was silent and still. No one spoke for what seemed like ages. Sirk just sat quietly, letting what he said sink in. Hoping they would believe him. Then, when they were ready, they would ask questions.
Hammond cleared his voice and the depression in the room subsided. O'Neill was the first one to speak. "You said you thought we were the Goa'uld?"
"It's not unheard of for them to make us think we're back on base to try to get information out of us. That's why I headed to the Control Room, to try and activate the gate to go home..." Again he trailed off, obviously knowing how hard getting home would be.
O'Neill asked another question. "How do you know we're not the Goa'uld?"
"When I was in the Control Room, the Jaffa who came through the gate, they were Serpent Guards. In my time, they're extinct."
"That is one amazing story, son." Hammond said, from the end of the table.
"It's all true, every word of it. Or it will be true." Sirk stood up and slammed his left hand onto the table then looked around the room at the unbelieving faces. "Come on! Look at my GDO! It's obviously not from this time! You have to believe me!"
Everyone looked at each other solemnly before Hammond ordered the 2 airmen to escort Sirk to one of the guest rooms to get some rest. Sirk got up and left the room, leaving the others to talk about his story.
"Well, should we believe him?" O'Neill questioned when the boy was out of the room.
"Major, is there any scientific fact behind his story?" The general asked.
"I'm not sure. The 1969 incident was caused by a solar flare, but he didn't mention anything like that. So I'll need to look into more causes."
"What about his story? I mean it's rather unbelievable." The general said, in his commanding voice.
"It would seem he was very passionate about it." Teal'c added. "It was hard not to see how much he wanted us to believe it."
"OK, so let's say I believe him, how would we stop those nasty events?" O'Neill added.
After a few puzzled seconds, Carter was the first to speak. "I would guess we would need to stop the first event. We would need to stop the mission that results in Teal'c's death."
"So, do we believe him?" Hammond asked, and then waited for the entire room's opinion.
"It's a kind of outrageous story." Carter began. "But then again, have our lives at the SGC ever not been outrageous? Besides, his GDO is definitely Human technology and definitely not from our time. So, the facts would point to him coming from the future."
"Indeed." Teal'c added.
"What about his escape attempt?" Hammond questioned.
"General, any member of any SG team who found themselves in the situation that kid's in would have responded the same way." O'Neill pointed out.
"So then, what do we do now?" The general asked.
"We should learn all we can from him, I mean, about our future." Daniel enthusiastically said.
"I don't think so. If any, we should learn about the catalyst of the events, and that's it. After that one event is changed, nothing else will play out the same." Explained Carter.
"Even so, we should learn about that GDO of his and any information he has about this Thoth and his technology. We'll all take the night to consider these things. We'll continue this briefing at 0800 hours tomorrow. Dismissed." The general got up and left. SG-1 gazed at each other momentarily, and then everyone began to head off.