Terminator 2: Judgment Day (1991)

A decade after the Terminator failed to kill Sarah Connor, Skynet sends a deadly new model, the T-1000, to kill her son John, the future resistance leader. But at the same time, a reprogrammed T-800 is sent to protect them. Sarah, in a mental hospital, and John, in foster care, face the shape-shifting T-1000 to stop Judgment Day.