In a post-apocalyptic future devastated by nuclear war, water has become the most valuable resource. Bands of survivors fiercely compete for control of the dwindling supply. One resourceful boy named Tommy lives in a desolate settlement that is on the verge of dehydration. Determined to save his community, Tommy sets out in search of a legendary water source rumored to be located deep in the wasteland. Along the way, he encounters a loner named Alien, a tough but reluctantly heroic figure who possesses exceptional skills in scavenging and combat. Alien initially resists getting involved, but when he sees Tommy's determination, he decides to help the boy in his quest.

As they journey through the harsh landscape, they face numerous threats from roving bands of marauders and other desperate survivors who will do anything to secure the precious liquid. Their mission becomes more perilous as they are pursued by antagonistic forces led by a ruthless warlord eager to hoard the water supply for himself. Despite the constant danger, Alien and Tommy form a bond and learn to rely on each other for survival. The journey tests their resolve and ingenuity as they get closer to discovering whether the fabled water source is real or just a myth born out of desperate hope.