It's 1984, and a Terminator has arrived from the future to kill Sarah Connor. But this T-800 unit looks like a statuesque Amazon with long, red hair and thanks to a mistake in accessing records, she's after the wrong Sarah Connor.
The Sarah Connor she's looking for is actually Sarah Lang, wife of Michael Connor, who is plotting her husband's demise in the hopes of walking away with a massive inheritance.
Unbeknownst to either Sarah or this new T-800, Connor has a guardian angel in the form of Ellis Ruggels. Ruggels and his partner Graves were sent through time by the Resistance to watch out for temporal activity. Graves was killed moments after landing on a freeway during displacement, but Ruggels has kept up his vigil year after year.
But can even his anti-Terminator weapon prevent the future's most lethal killing machine from completing its objective, or will SkyNet succeed in killing Sarah Connor? And in the end, are there some lives not worth saving after all?