The 100 (Season 4), which aired in 2017, continues to push the boundaries of its dystopian narrative, blending themes of survival, morality, and the human drive for power in a post-apocalyptic world. This season, like its predecessors, is centered around the struggle of a group of young survivors who were sent to Earth after humanity’s fall from grace, only to find that Earth is far from hospitable. As they continue to fight for their survival, Season 4 introduces new existential threats, moral dilemmas, and deepens the series’ exploration of leadership, sacrifice, and what it truly means to rebuild civilization.

The season picks up after the explosive events of Season 3, with the survivors of the 100—along with their allies—now aware of an impending nuclear apocalypse due to the radiation from the burning of a nuclear reactor at the facility known as the radiation zone in the last season. This looming disaster, combined with their ongoing fight for survival against human and environmental threats, sets the stage for the high-stakes drama that unfolds in Season 4. The key challenge in this season is the countdown to the nuclear fallout, which will wipe out life on Earth once again. The survivors must race against time to find a way to survive, and the threat of extinction becomes an ever-present concern.