In a post-apocalyptic world, where water and gasoline have long since dried-up, a prince from the oasis (one of the last known safe-havens) must venture out to find medicine for the ailing queen (Lucy Liu), but along the way he gets mixed up with the warlord (James Franco) and his robot Ash (Suki Waterhouse), which leads to a daring journey through the desolate wastelands.