All 13 episodes from the fourth season of the post-apocalyptic teen drama. 97 years after a nuclear war almost destroys the Earth, 100 expendable youths are sent to their ancestor's former home to determine if its surface is habitable, with the hope of repopulating the planet. As the 100 begin their quest they are forced to confront dangers in a world they have only seen from space and soon discover they may not be alone on Earth. In this season, in the aftermath of the devastating war, the group face some difficult decisions to ensure their survival after they are told of another impending nuclear apocalypse. The episodes are: 'Echoes', 'Heavy Lies the Crown', 'The Four Horsemen', 'A Lie Guarded', 'The Tinder Box', 'We Will Rise', 'Gimme Shelter', 'God Complex', 'DNR', 'Die All, Die Merrily', 'The Other Side', 'The Chosen' and 'Praimfaya'.