A hotheaded widow searching for the hit-and-run driver who mowed down her husband befriends an eccentric optimist who isn't quite what she seems.

A group of heroic firefighters at Seattle Fire Station 19—from captain to newest recruit—risk their lives and hearts both in the line of duty and off the clock. These brave men and women are like family, literally and figuratively, and together they put their own lives in jeopardy as first responders to save the lives of others.

A young man raised by scientists on Mars returns to Earth to find his father.

The series picks up four years after the events of Terminator 2: Judgment Day with John and Sarah Connor trying to stay under-the-radar from the government, as they plot to destroy the computer network, Skynet, in hopes of preventing Armageddon.