Chevron six encoded.
- Glad you could make it, Colonel. - Wouldn't miss it, sir. This is the best bit.
Chevron seven locked.
Proceeding with MALP transit.
MALP en route.
You look tense.
No, I'd say anxious.
I am neither tense nor anxious.
Perhaps concerned.
Why?
The address of this planet came from the repository of the Ancients.
Receiving MALP telemetry.
Nothing I can see resembles anything we know about the Ancients.
Architecture, technology, writing.
Maybe it came to this planet after the Ancients left it.
Teal'c, do you recognise any of this?
- I do not, General Hammond. - Nope. Neither do I.
I'm just saying.
- What's it doing? - Flying, sir.
- MALPs can't fly. - Apparently they can.
- Shouldn't there be a memo on this? - I do not believe we are still in control.
Run a systems diagnostic on the MALP.
- It's stopped transmitting. - Negative, sir.
We have a strong signal. We should be receiving video.
Uh, Major, you should take a look at this.
Sir, very high frequency oscillations are being transmitted on a feedback loop.
- They may be trying to communicate. - "They"?
Well, whoever "they" are.
- Exactly. - What?
Sir, I recommend we disengage the Stargate and analyse this data.
Agreed. Terminate the link.
Whoa! We got an EM spike! The system is overloading.
- Shut down. - I can't get in.
- Try override! - Control systems are locked out! Argh!
The computer's no longer under our control.
- Emergency disconnect, sir? - Do it!
- Major, are you OK? - Yes, sir.
Let's get him to the infirmary.
He's got first- and second- degree burns, sir.
- I'd like to run some more tests. - Very well.
The Stargate control systems and their redundancies are inoperative.
The circuitry in these terminals is fused.
- Any idea what that was? - None, sir.
The secondary systems are running, but it was one hell of an EM spike.
I'd like to run a diagnostic on the main computer.
- Yeah. After I treat this hand. - As soon as I...
- It is a very bad burn, Sam. - Five minutes.
- Now! - Do as the doctor says.
Yes, sir.
Thank you, Colonel. You, Daniel and Teal'c are next.
- What? I'm fine. - What? We're fine.
I would like to be the judge of that.
Some form of energy came through the Stargate.
It's only prudent to make sure there's no physiological effects to you all. ASAP?
- Who put her in charge? - The US Air Force.
In medical matters, Dr Fraiser may overrule those of any rank.
I'm not gettin' all my memos.
Well, by the looks of the control room, I'd say you're both very lucky.
I guess it could have been worse.
I'd like to know what it was trying to do.
Unfortunately, our best diagnostic tool for figuring that out was trashed.
- You're all done here. - Thanks.
- Reporting as requested. - Thanks, Teal'c. Just have a seat, please.
Can you freeze it just before it cuts out? I want a video capture of this hub thing.
I might be able to cross- reference the architecture.
No, I don't think this place is even remotely connected to Ancient Earth.
There. This is the start of the high- frequency oscillations.
They began seconds after we lost video and started to multiply exponentially.
Then the oscillations fused our equipment and made it impossible to measure them.
Now, if I isolate the smaller, more detailed signal and expand the time line...
There. It's a waveform of some kind.
- Alien signal. - Piggybacked on the MALP telemetry.
That must be how it came back through an outgoing wormhole.
I can't analyse it until I get the computers back up. My hands are tied.
- There are other computers. - Not that I can access.
General Hammond's put the SGC under quarantine.
- So information was accessed? - Apparently.
Why? By what?
We don't know, sir. But it branched out through very specific areas:
.. network and language software, system and application software.
- Learning to read, learning to talk. - And knowledge of our systems.
You're saying something was inside our computers?
We're just guessing at this point, but...
Whatever it was, we interrupted it before it completed its scan of our computer.
Did you determine any more from the MALP transmissions?
Nothing on or off world resembles the architecture. It's entirely alien.
We're running a virus scan and purging the entire mainframe.
Our file allocation tables were corrupted. There are sectors we'll never recover.
I'm maintaining DEFCON 2 and keeping the mountain locked down...
.. until you can tell me with confidence there'll be no further repercussions.
Yes, sir.
So it's a probe?
No, it's like a probe. We actually don't know what to call it.
Before we were able to cut it off,...
.. a structured EM wave navigated over half of our computer system.
- For what reason? - Well, we sent a probe to their world.
- So we're calling it a probe? - Sure.
We don't know what would have happened if we hadn't interrupted it.
- It did an awful lot of damage. - Perhaps that was the intention.
Maybe it was intended to be passive,...
.. but was so advanced that it fused our systems.
- We really have no way of knowing. - Now, what is this?
The high- frequency oscillations we received, time magnified and scaled.
Looks like high- amplitude tracings of an EEG.
- Like a brain wave? - Yeah.
Hello?
- It's still here. - What, the probe?
Well, whatever it is.
It sustained itself within our secondary systems...
.. while we were cleaning up the main computer.
Do I look fat?
It's like it wants us to know that it's here.
Come here often?
Yeah, all right, that's me.
Beg your pardon, sir. The dialling sequencer just went down.
- Take it off line, Sergeant. - Yes, sir.
- It's learning. - Learning what?
Uh, about us. Who we are, what we do here.
Put a stop to it, Major.
- Yes, sir. - We don't even know its intentions.
Doctor, I can't allow an alien technology into our computer systems.
Have we maintained quarantine?
Yes, sir. We're still isolated.
I don't want to contaminate the outside world.
I want whatever this is stopped right here, right now.
I think it likes me.
From what I can decipher, sir, it's like a computer program:
.. incredibly invasive, but as complex as a DNA strand.
And it's growing. It's eating more and more memory.
- Can you remove it? - This will take a shutdown...
.. of all systems connected to the mainframe,...
.. followed by a format of all drives.
Unfortunately, sir, all data not backed up before this event will be destroyed.
- But it's the only way to be sure. - Understood. Do it.
We'll be out of commission for a while, sir.
I've already alerted all offworld teams to stay put until further notice.
Yes, sir.
- Sergeant? - Stand by for systems power down.
Powering down.
Hey!
- All scans came back clean, sir. - Thank you, Sergeant.
We may have only lost data from the last 24 hours before the event.
We'll know more when I can access the SGC archives in the Pentagon.
I'd like you and Sergeant Siler to double- check your results before we do.
Yes, sir.
Major.
You're kidding!
Carter!
- Emergency lighting? - In the MALP room, yes, sir.
A small power- usage anomaly.
General Hammond said we should check it out.
- Forget to change a light bulb, Siler? - That's not my job, sir.
Yes, sir. Light bulb. Very amusing.
- It's warm. - Fire?
Alarms would be going off by now, Major.
It's been welded, from the inside.
By who? There's been nobody on this level since the power shutdown.
Get a torch.
- What is it? - I don't know, sir.
I think we robbed the alien program of an environment, so it created one.
It appears to be sustaining itself from the electric power from the emergency lights.
It must have gotten into a MALP, survived on battery power...
.. and built this... memory mainframe while we were on emergency power.
- "Memory mainframe"? - I know for a fact we wiped out a ton of it.
This program must be able to reproduce itself from a fraction of its original size.
And now it's expanding into whatever available memory it can find.
OK!
General, we're gonna need some claymores down here.
I'm on my way.
You want to blow it up?
- Yes. - Why?
Why?
Sir, we've isolated this area. There is no chance of reinfection of our computer.
It's obviously fighting to survive.
So do bacteria!
It's trying to communicate.
So do bac...
Sir, I agree with Daniel. This is a life form - obviously intelligent.
We've been in the same position as this alien entity I don't know how many times.
On another planet, cut off from our world, trying to stay alive.
What in God's name...?
Well, General, whatever got into our computers apparently has built a nest.
- Overnight? - According to the security log,...
.. there hasn't been any human activity in the MALP room for 36 hours.
For the record, sir, I want to blow it to hell. These folks want to chat with it.
Are you absolutely certain it can't reconnect to our computers?
General?
It's surviving on an emergency circuit, so it's isolated from the rest of the base.
We can kill it just by severing that connection.
- How do you intend to proceed? - Well, sir, it's provided an interface.
I'd like to try to make contact with it. If anything goes wrong, we cut the power.
Very well.
Maybe it's trying to figure out why we sent a probe to its world.
Major Carter?
Carter!
Start an EKG and EEG.
OK. On my count.
Three, two, one.
We in?
Charge the paddles 100.
Take over.
It's normal sinus rhythm.
Sir.
What? What is it?
These readings match those that infected the computer in the first place.
It's inside her.
These weaker readings are Major Carter's, these are the entity's.
How can a computer program be inside a human brain?
Sam said it was looking for memory within which to expand.
The human brain is capable of storing terabytes of information.
- How do you intend to remove it? - I doubt it's even possible, sir.
More and more of her brain's being stimulated.
It's impossible to tell if her memory's being suppressed, overwritten or erased.
General Hammond. I advise that Major Carter be placed under armed guard.
What?
If an alien entity has somehow invaded her body,...
.. then she is a security risk, and must be treated as such.
I agree with Teal'c.
The entity has fooled us twice. I'll be damned if I'll let it do it again.
She's to remain under guard at all times.
Yes, sir.
Carter?
She's conscious.
Can you talk?
Colonel, her PET scan resembles that of a stroke victim.
Parts of her brain seem very active. Others seem dormant or suppressed.
The entity has full motor control.
However, it might be able to communicate with a speech synthesiser if I explain it.
Just concentrate on getting it out of her, will ya?
I don't know how, sir.
What about the Tok'ra or Asgard? Don't they owe us a favour by now?
Till this situation is resolved, Colonel, we're still under quarantine.
That means from ourallies as well.
We cannot risk the entity leaving this facility.
It used a capacitor from the MALP...
.. to deliver a charge right through the keyboard, sir.
- Well, don't touch it. - Yes, sir.
- Sam said it was growing. Expanding. - Perhaps the entity that possessed her...
.. sensed that Major Carter's mind was a better memory- storage vessel.
- It was a trap. - A trap?
Yep. It was watching us the whole time.
Uh, so you're saying it knew Sam and I wanted to make contact with it?
Yeah.
The device was created as a delivery system, in order to invade her body.
- Yes. - Basically, what you're saying is that...
.. if we'd just listened to you in the first place and blown it up...
No, seriously. Is that what you're saying?
If we had destroyed the entity,...
.. Major Carter would not have been adversely affected.
OK, look.
I know your first instinct is to protect, both of you - that's your job - but...
.. no matter what happens, no matter how this turns out,...
.. Sam wasn't wrong to try to communicate with it.
O'Neill.
That's right.
Go get the doc.
And you are...?
I am within.
- You are O'Neill. - Yeah. We've established that.
This one has memory ofyou.
The "one" you're talking about is a person.
Her name is Major Samantha Carter.
Then... I am Major...
No. No, you're not.
We understand that you've taken control of Major Carter, but you're not her.
There was no other choice.
No otherplace to go.
You wished to terminate.
Still do.
But you will not. Not now.
I have observed.
You value the life ofone.
Yes, we do.
This one is important.
She is.
For this reason, this one was chosen.
You will not terminate this one in order to destroy me.
It went into Sam out of self- preservation.
I cannot be removed from this mind without terminating.
You will not terminate this one.
None ofyou will.
Therefore I will survive.
The entity insists Sam's mind is intact,...
.. but I can't detect anything beyond the barest trace.
I believe, even if I was somehow able to remove it,...
.. she would be essentially braindead.
I see.
Then why does the entity insist that Sam's mind is still within?
It's the only way to keep us from killing it.
Or it's telling the truth and we just can't detect it.
Even if Sam is still in there somewhere, it won't be for long.
The entity's influence is still growing, and there is nothing I can do to stop it.
What course of action remains?
Well, it wants to survive, so... we offer to send it home.
This alien technology is capable of travelling back to us...
.. through an outgoing wormhole.
I won't risk the same thing happening again.
I've already ordered that the coordinates be locked out of the dialling computer.
Let me talk to it. Maybe we can... convince it to leave willingly.
Very well, Dr Jackson.
Dismissed.
Jack.
Sir?
We may have to make some difficult choices.
I know that Major Carter means a great deal to you.
She's a very valuable member of my team, sir.
Yes, she is.
My name is Daniel.
I am aware.
Right. You, uh... you read my file.
- Yes. - Then you know I am a scientist.
Yes.
You have determined I cannot be extracted.
Yes.
I will now offerinformation in exchange for continued survival.
We don't want your information. We want Sam.
Leaving this mind would cause termination.
You left that thing you constructed in the MALP room. Go back.
I have already grown beyond its capacity.
Why... why did you do this? Why did you come here in the first place?
- You attacked. - No, we sent a probe.
Yes?
It's, uh... something we do to determine whether or not a place is safe for humans.
Radio energy was emitted from yourprobe.
Contagion.
- Much damage was caused within. - Within what?
Within us.
It spread before we understood it was poison.
You're saying your world was damaged by radio waves from one probe?
Yes.
We didn't mean to hurt you. It was a misunderstanding.
Yet it is done.
So you came here to... to what?
- Preserve. - Preserve your world?
- Yes. - How?
By destroying you.
Well, that's not gonna happen.
Transmission was interrupted.
Ifl had been able to complete transmission,...
.. you would have been destroyed.
My world would have been preserved.
Well, in a way, you succeeded.
We won't go back there.
You can repair the damage and we won't send any more probes through.
Yes, we will.
Jack?
We'll send dozens of'em.
One after another.
I don't care what it does.
- No. - Leave her. Now.
You won't.
You've read my file. Think again.
- I must preserve. - Fine. Stick to your guns, then.
- Jack... - Daniel, we're gonna do this my way.
You can't.
- General? - You're damn right we can.
No. Please.
Leave her.
- I must preserve. - If you want to preserve your world,...
.. leave Major Carter right now.
Stand down!
Let her go!
We have an emergency situation: corridor 649.
I believe the alien is attempting to return to the mainframe.
Still no change.
I don't know if she ever told you this, Colonel, but Sam made a living will:
.. "No extraordinary means. "
Yeah, she told me.
There's, uh... there's no brain activity of any kind.
No brain wave for either Sam or the entity.
She's being kept alive entirely on life support.
I think it's time to let her go, sir.
Just, uh... give it a minute, huh?
Hammond ordered the mainframe thing in the MALP room destroyed,...
.. in case the entity managed to find its way back in there.
That's probably what it was trying to do.
Sir, we're go for a systems restart.
- Proceed, Sergeant. - Yes, sir.
All operational systems are back on line.
Get back!
It's the MALP room, sir.
SG-1 to the MALP room immediately.
I think our friend is back, sir.
All right, let's blow it.
Wait. Wait, wait, wait, wait, wait.
Look at this.
- The entity. - No, it said it couldn't go back.
- It's Sam. - Daniel... I shot her twice.
After it transferred Sam's consciousness out of her body.
You killed the entity after it put Sam into this... this thing.
- She's in here. - Why?
- Why would it do that? - You demanded it.
You threatened to send an army of probes to its home world.
Saving Sam and allowing itself to be killed...
.. was the only way to preserve its home world.
Get me Hammond.
- Hammond. - General, we've got a situation here.
Same here, Colonel. I'm on my way.
This EEG matches Sam's. I don't know how, but it's her.
- What do we do? - There's nothing I can do, sir,...
.. but to provide a conduit for her to return into her own body.
The entity has deceived us on several occasions.
Go ahead, Doctor.
Yes, sir.
She's back.
Hey, Carter. Where you been?
- It's gone? - Yes, it is.
I was shouting... for you to hear.
We heard.
Visiontext Subtitles: Stephanie Donohue