Rimworld: Judgment Day - Episode 3: The Human Resistance Attacks
SkyNet had an additional contingency plan in the event of its defeat - sending 4 T-800 infiltrators containing a backup of SkyNet to a distant future planet. Unfortunately, such a large distance traveled resulted in a large time skip into the future...
The terminators repel a human assault on the base, acquiring a variety of human weaponry in the process.