"The 100" is a post-apocalyptic science fiction television series based on the book series by Kass Morgan. The story begins nearly a century after a nuclear apocalypse has devastated Earth, forcing the last survivors to live in a space station called The Ark. When resources begin to dwindle, 100 juvenile delinquents are sent back to Earth to determine if it is habitable again. As the group lands, they discover that Earth is not as empty as they expected. They encounter various factions, including the Grounders, who have survived the apocalypse, and the Mountain Men, who live in a fortified facility. The series explores themes of survival, leadership, and the moral dilemmas faced by the characters.