Ethan (Douglas Smith), a young man with amnesia, wakes to discover that humanity has destroyed the earth and nature is reclaiming itself with moss-covered roaming dead. In this dangerous post-apocalyptic future, Ethan clings to one purpose, finding his girlfriend Emma (Kimberly-Sue Murray). He soon finds himself in the crosshairs of Mae (Carrie-Anne Moss), a tenacious and eccentric survivalist. Unable to rely on his own fragmented memories, Ethan forms an uneasy alliance with Mae. Under constant attack from the moss-covered ‘reclaimed’, Ethan crosses paths with Kai (Frank Grillo), a mysterious figure who may hold the secret to his fractured memories.