Six months after aliens invaded the earth, the regimes of various countries have already fallen apart, and the surviving people have formed their own organizations and groups to fight for getting rid of aliens and continuing their lives.
In order to truly conquer the earth, aliens plunder human children everywhere, equip them with shells that can communicate with aliens and turn them into slaves. While fighting against aliens, the Resistance Army tried to save these controlled children.
However, the rescued children can still receive signals from aliens because their carapace cannot be completely removed. Some children began to rebel under the temptation of aliens, and the next generation of people on earth are constantly falling.
At the end of the fourth season, members of the second independent regiment planned to dig out the shot down Espheni bomber. At the same time, Tom, the male owner, and a small team went to a secret resource warehouse to find equipment that could speed up the excavation process.
Tom and others in the Second Independent Regiment are determined to learn to fly the Espheni bomber-this will be a key step in their plan to destroy the Espheni energy core. They drew lots to decide who would carry out the dangerous task.
Seeing that death is just around the corner, some long-hidden contradictions are finally exposed, and many people have a fierce confrontation with each other. After solving these contradictions, the second independent group is more United than before.