The series is set 97 years after a devastating nuclear war wiped out almost all life on Earth. The only known survivors are the residents of twelve space stations in Earth's orbit prior to the war. The space stations banded together to form a single massive station named "The Ark", where about 2,400 people live. Resources are scarce and all crimes no matter their nature or severity are punishable by death ("floating") unless the perpetrator is under 18 years of age. After the Ark's life support systems are found to be critically failing, one hundred juvenile prisoners are declared "expendable" and sent to the surface in a last ditch attempt to determine if Earth is habitable again. The teens arrive on a beautiful planet they've only seen from space. Confronting the dangers of this rugged new world, they struggle to form a tentative community. However they discover that not all humanity was wiped out. There are people on Earth who survived the war, called "grounders" by the 100. The ...

When young girls start to go missing within a religious cult, older followers fear a long-told prophecy while the younger members suspect abusive elders are killing them off.

Wren's Halloween plans go awry when she's made to babysit her brother, who disappears into a sea of trick-or-treaters. With her best friend and two nerds at her side, she needs to find her brother before her mom finds out he's missing.

A group of teenagers get ready for their high school prom.