Steamboy is an anime film that premiered in summer 2004, produced by Sunrise.

About the production: the story comes from an original script, the film runs about 126 minutes and its current status is "finished".

Its main genres are action, adventure, drama and sci-fi, with themes such as Military, Steampunk, Historical and Ojou-sama.

On AniList, Steamboy has an average score of 70%, a good score, and appears on 21,240 users' lists.

Ray is a young inventor living in the U.K. in the middle of the 19th century. Shortly before the first ever Great Exhibition, a marvelous invention called the "Steam Ball," behind which a menacing power is hidden, arrives at his door from his grandfather Lloid in the U.S. Meanwhile the nefarious O'Hara Foundation has sent men to aquire the Steam Ball so that they can use its power towards their own illicit ends. (Source: Anime News Network)

Official synopsis from AniList.