Ragtag survivors and resistance fighters struggle to endure following a catastrophic alien attack in this drama executive produced by Steven Spielberg. At the core of the story is Tom Mason, a bookish Boston professor who becomes a commander of a regiment of citizen soldiers. But his primary focus is the safety of his three sons, one of whom was taken captive by the aliens. Mason helps wage a counterattack against the extraterrestrial invaders, whose purpose remains a mystery.