The story is set in the year 2563, in a post-apocalyptic world ravaged by a war called “The Fall”. Most of humanity now lives in Iron City, a giant slum beneath the floating city of Zalem, which remains mysterious and inaccessible to those below.

The main character, Alita (Rosa Salazar), is a robot discovered in a junkyard by Dr. Dyson Ido (Christoph Waltz), a compassionate cyber doctor. Ido repairs Alita, but when she wakes up, she has no memory of her past, nor does she know her true nature. As she begins to explore the new world, she befriends a young man named Hugo (Keean Johnson) and becomes increasingly curious about her origins.

Alita soon discovers that she possesses extraordinary fighting abilities and that her body is designed for martial arts. As she delves deeper into her past, she finds herself caught up in a power struggle between Zalem’s forces, the ruthless hunter-warriors who enforce the laws of Iron City, and the oppressive government led by Nova, The mysterious and invisible ruler of Zalem leads. .

Alita must fight not only for her survival but also for those she cares about, including Dr. Ido, Hugo, and others who face oppression from the system that controls Iron City.