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Can terminators sense and detect each other from, say, electromagnetic emissions they presumably radiate?

In Terminator 2, Schwarzenegger (T800) and Patrick (T1000) are reasonably close to each other in the shopping mall scene but do not seem to register each other, while in the attack on the Skynet Base in Salvation (?) a terminator guarding the base is able to recognise a corrupted terminator being used by the Resistance.

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  • I don't remember the scene you mention in Salvation (Terminator 4). Was it on the pretty end or somewhere in the middle?
    – Clockwork
    Commented May 31, 2023 at 15:45
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    @Clockwork - jim might be referring to the scene where Marcus Wright (Sam Worthington) infiltrates Skynet's Los Angeles HQ -- hoping to locate Kyle Reese -- and is recognised on sight by a giant Terminator guard. But Skynet was expecting Marcus to return to the HQ at some point, since that was its plan all along, so it follows that the Terminator guard was programmed to recognise Marcus on sight, much as the T-800 in T2 was programmed by John Connor to recognise his younger self on sight (unlike the T-1000, which needed to acquire a photo of John from his foster parents first). Commented May 31, 2023 at 16:35
  • It seems plausible to me that terminators perhaps are able to phone-home to Skynet, which could be aware of their locations and which could be coordinating them. In the past, however, no such central authority exists yet, and therefore terminators in the past might not be able to recognize each other immediately.
    – jamesdlin
    Commented Jun 1, 2023 at 2:43
  • T800s and T1000s are both infiltrators. "Maybe they don't show up on infrared at all!" What they both are in Salvation is simple combat chassis, with Skynet pinging them at all times, hooked into everything and pissed off that they didn't get a harrumph outta that guy. "The 600 series had rubber skin." : youtube.com/watch?v=xcPeTeTBqHE But these are new. Sweat, bad breath, everything.
    – Mazura
    Commented Jun 2, 2023 at 1:49

1 Answer 1

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Terminator: The Sarah Connor Chronicles continuity

In the Terminator: The Sarah Connor Chronicles (2008-2009) continuity, it appears that terminators can't automatically identify one another as terminators via electromagnetic emissions or whatnot.

In S01E01, "Pilot," there's a scene where two terminators -- Cromartie, a T-888 sent by Skynet to kill John Connor, and Cameron, a T-900 sent by the older John to protect his younger self -- were in the same high school classroom, along with John, and neither seemed aware that the other was a terminator until they started blatantly acting like terminators.

Later in the same episode, Cameron was briefly able to fool Cromartie into thinking she was John by wearing his clothes (including a hoodie, with the hood up) and mimicking his voice.

Image of Cameron from "Terminator: The Sarah Connor Chronicles" S01E01.

In S02E06, "The Tower Is Tall But the Fall Is Short," Cameron and Rosie -- a female terminator sent by Skynet -- apparently failed to identify one another as terminators initially, despite entering a building at the same time and standing in an elevator together. They did ultimately realise they were both terminators when they attempted to enter the same room within the building at the same time.

In S02E22, "Born to Run," a T-888 -- dubbed the 'Water Delivery Guy' by the Terminator Wiki -- was sent by Skynet to kill Catherine Weaver, but when he confronted her, he appeared to think she was human, seemingly unaware that the real Weaver had been replaced by a T-1001 imposter six years earlier.

In S02E11, "Self Made Man," Cameron recognised Myron Stark -- a T-888 she saw in an old photograph -- because she already had a picture of him stored within her internal database.

Image of Myron Stark from "Terminator: The Sarah Connor Chronicles" S02E11.

In S02E14, "The Good Wound," John Henry revealed to Catherine Weaver that he knew she wasn't human. She asked how he could tell and he explained that when he looked into her eyes, there was "nothing there," implying that her lack of emotion was enough for him to tell she wasn't human.

JOHN HENRY: You're not human.

CATHERNINE WEAVER: Excuse me?

JOHN HENRY: You're not human. You're made of metal. Not the same metal as I am, but metal.

CATHERNINE WEAVER: How can you tell?

JOHN HENRY: I looked into your eyes. There's nothing there.

Terminator: The Sarah Connor Chronicles - S02E14 - "The Good Wound"


Terminator Genisys continuity

In the Terminator Genisys (2015) continuity, it appears that terminators can automatically identify one another as terminators, not via electromagnetic emissions, but through a visual analysis.

Pops opened fire on the John Connor terminator on sight, with a subsequent POV shot indicating that Pops could see that John was made of Machine-Phase Matter.

Image of John Connor from "Terminator Genisys."

Pops could also see when there was a piece of a T-1000's mimetic polyalloy mimicking part of a van he was driving.

Image of mimetic polyalloy from "Terminator Genisys."

And the T-800 sent to 1984 to kill Sarah recognised Pops as another T-800 on sight. In this specific instance, the two terminators were the exact same series (800) and model (101), and Pops spoke to the T-800 first, which may have helped to give him away. Then again, it may not have mattered, as these terminators appear to have superior visual capabilities to the ones in Terminator: The Sarah Connor Chronicles.

Image of Pops from "Terminator Genisys."


Other Terminator continuities

I've yet to pinpoint any clear evidence confirming whether or not terminators can automatically identify one another as terminators in continuities other than the two named above.

I checked the scene where the T-800 and T-1000 encountered one another for the first time in the official novelisation of Terminator 2: Judgment Day (1991), but that didn't reveal anything useful, as the scene was described from John Connor's perspective, rather than that of either terminator.

The scene where the T-800 and the T-1000 spoke to one another on the phone suggests they couldn't tell they were speaking to another terminator by the sound of their voice, though. Otherwise, the T-1000 would've immediately known when he was speaking to the T-800 rather than John, and the T-800 wouldn't have needed to trick the T-1000 into revealing that he didn't know the name of John's dog, Max, in order to determine that he wasn't really speaking to John's foster mother.

In Terminator Salvation (2009), Marcus Wright was recognised on sight by an automated defense system guarding the perimeter of Skynet Central, but Marcus was an unwitting agent of Skynet who was intended to lure John Connor to Skynet Central, so it's only natural that the defense system would recognise him and grant him entry; it specifically knew his name, which helps to corroborate that. Not to mention that his metal endoskeleton was exposed through holes in his damaged flesh at the time, so he didn't exactly look like a regular human.

Image of Marcus Wright from "Terminator Salvation."

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  • "It's unclear if a similar visual analysis would identify another T-800 as a Terminator, though, given that T-800s are enveloped in actual flesh and blood." - Here's a scene where exactly that happens: youtu.be/UZnkAElIe_c?t=24 Commented May 31, 2023 at 20:11
  • Additionally, here's a bit where it identifies part of a T-1000 via a rear view mirror: youtu.be/5cXCn0RHGOg?t=154 Commented May 31, 2023 at 20:27
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    @TransparentBlue - T-800s in the Genisys continuity apparently have superior visual capabilities to the Terminators in The Sarah Connor Chronicles continuity. It's unclear whether that applies to the other continuities though. Commented May 31, 2023 at 20:35
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    I was really pleasantly surprised by the Terminator TV series. The singer from the band Garbage being in it was another pleasant surprise. I thought it was a shame that they canned it so soon.
    – Aaron F
    Commented Jun 1, 2023 at 0:38
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    Oh, @AaronF, how could you miss that. The show wasn't canned, it was... <dons shades>...
    – nitsua60
    Commented Jun 1, 2023 at 2:27

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