Two terminators, the T-800 & the T-1000, are sent from an apocolyptic future back to Los Angeles, 1991. The T-800 is reprogrammed as a protector to John Connor, the future savior of mankind, who is currently living with foster parents. Sarah, his mother, is locked up in the Pescadero Mental Hospital. The T-800, John, and Sarah flee from the seemingly unstoppable T-1000. They are joined by Miles Dyson, a computer programmer/technician who is inadvertently responsible for the rise of the machines. Together the four break into Cyberdine Systems in an attempt to destroy the technology and stop the war from occuring.