A seemingly indestructible humanoid cyborg is sent from 2029 to 1984 to assassinate a waitress, whose unborn son will lead humanity in a war against the machines, while a soldier from that war is sent to protect her at all costs.
A cyborg, identical to the one who failed to kill Sarah Connor, must now protect her ten year old son, John Connor, from a more advanced cyborg.
Special Forces commandos are abducted mid-operation by a mysterious spacecraft and, upon awakening, find themselves prey to a relentless alien race in a fight for survival.