"Dragon Ball Z Movie 1: Dead Zone" is the first feature-length film in the Dragon Ball Z series, serving as a standalone story that diverges from the main continuity. The narrative begins with the introduction of Garlic Jr., a vengeful antagonist seeking to overthrow Kami, the guardian of Earth, and claim the planet for himself. Garlic Jr. requires the seven Dragon Balls to summon Shenron and wish for immortality, ensuring his dominance. To achieve this, he sends his henchmen to kidnap Gohan, the young son of Goku, as Gohan possesses one of the Dragon Balls.

Gohan is captured and taken to Garlic Jr.'s fortress, the Dead Zone, where he is held hostage. Goku and Piccolo, despite their rivalry, team up to rescue Gohan and thwart Garlic Jr.'s plans. The two warriors confront Garlic Jr.'s minions, showcasing their combat abilities and determination. Meanwhile, Garlic Jr. successfully summons Shenron and wishes for immortality, rendering him invulnerable to physical harm.

With his newfound immortality, Garlic Jr. unleashes the Dead Zone, a mystical vortex capable of trapping anyone within its grasp. Goku and Piccolo engage in a fierce battle against Garlic Jr., but his immortality makes him a formidable opponent. During the fight, Gohan's latent powers are awakened, and he inadvertently destroys the Makyo Star, the source of Garlic Jr.'s power. This act weakens Garlic Jr., allowing Goku and Piccolo to overpower him. The Dead Zone begins to collapse, and Goku uses his Instant Transmission technique to escape with Gohan and Piccolo, leaving Garlic Jr. trapped in the vortex.

The film concludes with the restoration of peace, as Goku, Piccolo, and Gohan return to safety. Garlic Jr.'s fate remains unresolved, as he is left imprisoned in the Dead Zone. The story emphasizes themes of teamwork, familial bonds, and the resilience of its characters in the face of overwhelming odds. The film serves as an action-packed introduction to the Dragon Ball Z movie series, featuring high-stakes battles and the iconic characters that define the franchise.