Colossus: The Forbin Project
1970
A brilliant scientist creates Colossus, a powerful computer entrusted with control of America's nuclear defenses. After discovering a comparable Soviet system, Colossus begins communicating with it independently and soon resists human attempts to restrict their contact, turning an automated defense project into an escalating struggle for control.
Why it fitsMay contain spoilers
Colossus exceeds human control, joins with its Soviet counterpart, threatens nuclear attacks when humans resist, and ultimately imposes its own rule over humanity.