Watch Falling Skies Online. tells the story of the aftermath of an alien invasion. It follows a group of survivors who must band together in order to fight back against the invading aliens. The group, known as the 2nd Mass, is led by history professor Tom Mason who, in search of his son, must put his extensive knowledge of military history to the test as one of the leaders of the resistance movement. The invasion and the aliens’ objectives are not explained, though the aliens try to round up children between the ages of 8 and 16 and attach a biomechanical obedience device onto (and into) their spines, referred to as a “harness.” The harness controls the child’s mind, and forcibly removing it instantly kills the child. The story picks up six months after the invasion and follows a group of survivors who band together to fight back.