Kevin Costner's soggy sci-fi adventure is set on a future Earth covered with water. Humans have to survive on makeshift floating cities, although some of them are determined to find their planet's equivalent of an oasis: ' Dryland'. Only the young Enola knows the secrets of this mythical place, & she becomes a pawn in the power struggle between the Mariner (Kevin Costner) & his evil nemesis Deacon (Dennis Hopper).