In our review of the Terminator Anthology collection, it is explained that:
the franchise tells the story of the war between humans and machines. In the future, the U.S. strategic defense computer system, known as Skynet, will become self-aware. To protect itself from being turned off, Skynet begins a nuclear war, referred to as Judgment Day. While many of the remaining humans are put into labor camps, a resistance rises up, led by John Connor. Before the humans can defeat Skynet, it creates a time machine, which it makes use of multiple times by sending cyborgs known as Terminators back into the past in an effort to alter the timeline.
James Cameron’s The Terminator a T-101 model (Arnold Schwarzenegger) from 2029 is sent back to 1984 to kill John Connor’s mother, Sarah (Linda Hamilton). To protect her, Kyle Reese (Michael Biehn) is sent back by the resistance.
Dark Horse Comics' Terminator: Enemy of My Enemy, written by Dan Jolley and featuring art by penciller Jamal Igle, who did the cover art, and inker Ray Snyder, is set the following year in 1985. According to the press release "Skynet targets a scientist whose discoveries threaten its future, but this time there is no resistance fighter sent back to face it! With only enemies around her, what chance does Elise Fong stand against the perfect killing machine?" Terminator: Enemy of my Enemy #1 goes on sale February 19.