Spoilers for Quarantine, Ark of truth, Last Man, and possibly Continuum, all of SG-1 and everything in Atlantis up to BAMSR it should basically be just a reference or two for most of them and obviously most of the episodes are not going to be referenced. Everything is accepted as seen on screen until after BAMSR. I'll also be referencing other eps throughout the seasons but events in them may be changed based on how it differs.

Pairings: John/Teyla (main)

There is also a crossover of some SG-1 character during later chapters.

Chapter 1

She regretted having to tell him what to do but someone needed to and as his commanding officer it was her responsibility. She remembered how she felt when her team had been ordered to replace Daniel although he had died and Teyla was only pregnant but still you never liked to replace a member of your team. "Are you sure you don't want someone else to accompany your team on this mission Colonel," Colonel Carter asked.

"Yes we will be fine without Teyla for time being," he responded.

"For this mission you may proceed with a three man team however you will have to choose a temporary replacement until you place Teyla back on active duty."

"Understood Colonel," Colonel Sheppard said before turning around and heading through the wormhole. On the other side the team walked in silence for a few minutes before Ronon decided to break it.

"Who are you going to choose to replace Teyla?"

"Haven't really put much thought into it don't really want to either," he said attempting to kill the conversation however Rodney had other ideas.

'You're the one who took her off of active duty."

"Yes Rodney I can't have her going off world while she's pregnant."

"I suppose but still."

"You're not actually suggesting that we have pregnant women out hunting the wraith?"

"Wait I'm picking up an energy signature," Rodney said quickly.

"Do you ever not pick up an energy signature?"

"Yes but this one is very large."

"Let's go check it out," he ordered glad for distraction albeit a boring one.

They walked through the forest for another half an hour and entered a clearing where they saw a massive structure, "I think we found your power signature."

"Actually for a building that size the signature is pretty small."

"How small?"

"A single generator," Rodney said clearly disappointed.

"Well we better check it out anyway." Sheppard said once again heading to the structure.

Ronon grunted and followed them towards the Ancient facility. Upon entering the facility the team split up with Rodney going after the energy source Ronon wondering aimlessly and John heading to the control room. When Sheppard entered the control room it lit up as usual however he noticed that there was a large life signs like detector or one of the walls, "Rodney you might want to get up here."

"Sheppard what did you just do I'm reading a 200% increase in power."

"I just turned everything on you might want to get up here though Rodney."

"Yes, yes I'll be right there." He said before heading in the direction Sheppard had gone.

Rodney arrived hooked up his Tablet and began taking some readings. After a few minutes John sat down resting on a nearby wall and fell asleep while Rodney continued to work. A few minutes later Rodney woke him, "Hey Sheppard you might want to see this."Sheppard, unhappy at being roused from his sleep simply grumbled as he got up.

"I think I know what this place does," Rodney said cheerily.

"And what does it do Rodney?"

"It's the Ancients long range sensors largest sensor array."

"Don't we have those on Atlantis?"

"Well yes and no yes in that we do and no in that these sensors are much more powerful they contain data for this entire galaxy and surrounding area," Rodney said excitedly tapping on his Tablet as he moved around the room.

"And what does that mean Rodney?"

"We will know where every single vessel capable of Space flight is in this galaxy."

"So?"

Now starting to get annoyed Rodney tried one last time to get him to understand, "Well if the ancients left any ships than we can retrieve those we can see where the wraith are going to cull however I don't know what these signatures are both different colors and yet only one of each in the galaxy."

"New types of ships?"

"It's a possibility well have to check it out or it could be previously undiscovered ancient ships."

"Ronon were going back to the gate McKay found something important that he wants to bring back to Carter."

"Meet you back at the gate," he said quickly before ending the communications link.

On the way back to the gate Rodney tried to talk with John however he was unresponsive and what few answers he gave were vague and nondescript after several minutes. Sheppard had to tell Rodney to be quiet after which Rodney did finally. They made their way through the gate without anything eventful happening. Rodney held a briefing a few hours after returning with most of the senior staff present.

"Of what I've gathered this is the ancient's largest sensor array in the galaxy its range easily encompasses this galaxy and a good deal of the nearby space. "

"How small can it detect down to?" Colonel Carter inquired

"I think I saw jumpers and darts however there were some unidentified signals"

"How many?"

"Two or three one is actually on a planet and I checked the sensor logs a bit and I think that it hasn't moved since the ancients first left this galaxy."

"All right let's move on it you leave tomorrow take SGA-2 as backup and Colonel Sheppard a word."

They departed except Colonel Sheppard who remained to talk to Carter, "yes Colonel"

"Are you considering filling Teyla's position on the team?"

"Not yet I don't think I will be able to find anyone who can replace her," he meant it in more ways then Carter thought.

"I understand however you will have to add a fourth member after this mission."

End Chapter 1