All episodes from every season of the US sci-fi drama following the aftermath of an alien invasion. Six months previously the Earth suffered an extraterrestrial attack on a global scale, which left only ten percent of the human population alive. Now soldiers and civilians are banding together in an attempt to fight back. Former university professor Tom Mason Noah Wyle is made second-in-command of the Second Massachusetts and must put all his knowledge of military history to the test to aid the cause. Meanwhile, he hopes to find his 14-year-old son, Ben Connor Jessup, who has been taken by the enemy and fitted with a 'harness', a device that enables the aliens to control children. Season 1 episodes are 'Live and Learn', 'The Armory', 'Prisoner of War', 'Grace', 'Silent Kill', 'Sanctuary Part 1', 'Sanctuary Part 2', 'What Hides Beneath', 'Mutiny' and 'Eight Hours'. Season 2 episodes are 'Worlds Apart', 'Shall We Gather at the River', 'Compass', 'Young Bloods', 'Love and Other Acts of Cou