Alita: Battle AngelSave

300 years after a catastrophic war called The Fall, Earth has been transformed. The wealthy and educated live in floating sky cities (called Zalem); the working classes live in Iron City, a sprawling junkyard metropolis on Earth's surface. The opening establishes Dr. Dyson Ido (Christoph Waltz) — a cybernetics specialist who scavenges the Iron City junkyards beneath Zalem for valuable cyborg parts. Ido discovers a still-functioning cyborg head in the trash; the head, when activated, contains the consciousness of a young woman with no memory.

Ido rebuilds the cyborg head into a fully-functional body — using a custom-built cyborg-body chassis that gives the woman new mechanical limbs and skeletal structure. He names her Alita (the actual Spanish name; Rosa Salazar as the motion-capture performer); the original woman's identity remains unknown. Alita's gradual exploration of Iron City reveals the city's brutal social hierarchy: corrupt police, hunter-warrior bounty hunters, underground bomb-shipping rings, and the constant threat of the wealthy Zalem residents above.

Alita meets a young man named Hugo (Keean Johnson) — a street-level entrepreneur who has been salvaging cyborg parts to fund his eventual emigration to Zalem. Hugo's romantic interest in Alita is the film's primary emotional anchor; their relationship gradually deepens as Alita explores Iron City under his guidance. Hugo's commitment to Zalem-emigration — which he believes will provide him with a better life — creates the film's primary moral tension; Alita gradually realisizs that Hugo's social ambitions may conflict with her own emerging warrior identity.

Alita gradually discovers her warrior heritage when she encounters Motorball — a cyborg-driven sport played in massive Iron City arenas. Watching the Motorball matches awakens Alita's instinctive memories of combat techniques; she begins practicing her cyborg combat capabilities. Her training escalates when she discovers a 300-year-old Martian Republic Berserker military body in an Iron City junkyard. Berserker bodies are forbidden technology — manufactured during the pre-Fall Martian War for the Republic's elite combat forces.

Alita's emerging warrior identity attracts the attention of Vector (Mahershala Ali), Iron City's most-powerful underground crime lord. Vector has been operating an elaborate scheme to smuggle bounty-hunter targets out of Iron City; his connection to Zalem's surface-level political authorities is the franchise's primary political conspiracy. Vector's enforcer Grewishka (Jackie Earle Haley) is a massive cyborg whose physical confrontations with Alita provide the film's primary action set-pieces.

Hugo's secret — he has been involved in Vector's bounty-hunter target-acquisition operation — is gradually revealed to Alita. The discovery is the film's primary moral test; Alita must choose between her romantic feelings for Hugo and her commitment to combat-warrior ethics. Hugo's death in a third-act confrontation provides the film's primary emotional catharsis; his sacrifice while trying to climb the Zalem cable system is the franchise's most cinematically composed sequence.

Alita's final confrontation with Vector and Grewishka takes place at the Motorball arena's championship match. Alita has been training as a Motorball-arena professional; her combat skills are now substantially developed. The match becomes a covert battle between Alita and Vector's hired assassins; Alita defeats Grewishka in single combat and impales Vector with her sword. The film's epilogue shows Alita ascending the Motorball-championship pinnacle, gazing up at Zalem in defiance — a clear setup for a planned sequel that has not yet been produced.