Since the first Terminator failed, Skynet sent back increasingly sophisticated Terminators.

Another strategy would have been to send back multiple Terminators. Why was that not attempted? Was there a cost (e.g. power) to sending them back in time?

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    In The Sarah Connor Chronicles TV series, Skynet indeed sent hundreds of terminators back in time..
    – user931
    Commented Nov 24, 2017 at 16:51

2 Answers 2


According to Kyle Reese, "Skynet's defense grid was smashed; we won." Their defeat was inevitable. Sending a Terminator back was a last ditch effort on Skynet's part to try and erase the leader of the human resistance from history. Skynet likely didn't have the time, resources, or enough troops in general, to send back more than one, especially considering the considerable power drain that it took to send back even one unit.

Assuming that Skynet was able to send back a whole army, it would likely run into significant resistance from present day human armies, which number in the millions and are backed by intact governments with fully functional industrial bases. Against a ragtag group of rebels, terminators were still being destroyed. Even without futuristic weapons, massive damage does affect them, especially when talking about airstrikes and other things such a massive force would be able to bring to bear against what is essentially an invading army.

This was essentially a stealth mission: the terminator is, as described by Reese, as an infiltration unit, designed to be mostly undetectable. Skynet obviously recognized this as a mission parameter & probably wanted the terminator to complete its mission as "quietly" as possible without anyone finding out about the technology used to create it, so sending one was much more advantageous.

The last point is the changing timeline. With each iteration, something changed. Just like the creation of Skynet was inevitable, so was the creation of John Connor. This didn't stop Skynet from trying, but it also knew that radical changes were much more likely to bring about the future that it was trying to prevent, rather than the future it was trying to bring about.

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    Great answer, especially about the possibility of Terminator technology falling into human hands (as in T2). This would be both an advantage to Skynet (helps in its creation) but also a disadvantage (humans could build weapons to defeat them, once they know about the threat). Commented Feb 14, 2012 at 14:11
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    Of course as seen in T2 and T3, the humans didn't seem to worried about being able to destroy their creations.
    – Xantec
    Commented Feb 14, 2012 at 14:28

Alternative to wraith808's answer:

Each time a Terminator was sent back in the movies, the timeline shifted a little. Skynet got better technology, slightly earlier. As of the Sarah Connor Chronicles (the TV show), the timeline had shifted enough that the war was now in favor of Skynet winning.

It also showed that the kill-John-Connor-in-the-past tactic was simply one front on an infiltration war throughout the entire past century; from Skynet's point of view, he was no more important than anything else it was attempting to change in its favor.

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    +1 You can assume that several terminators were sent back in time but no one in the movies knew about it Maybe they were defeated but left no survivors to tell about it or they destroyed themselves after achieving their objective to protect the time line or the event was hushed up like the first terminator that we know about. Commented Feb 16, 2012 at 12:50

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