'Ultimo the Mechanical Boy'), is a Japanese manga series created by American comic writer Stan Lee (and his production company Pow Entertainment) and illustrated by Hiroyuki Takei.

[4] Viz Media later licensed the manga for an English language adaptation in North America and published "Chapter: 0" in the September 2008 issue of Shonen Jump.

As in the past, Yamato meets the "Karakuridôji", mechanical boys, that transform his otherwise normal life into a battle of good versus evil.

With imminent destruction at hand, Yamato uses Ultimo's ability to bring the world back to the day he first meets the dôji.

In order to avoid the catastrophe from repeating itself, Yamato plans to learn for himself the meanings of "good and evil" by meeting each of the dôji himself.

The major characters in Ultimo possess their own Karakuridôji, humanoid dolls each based on the Six Perfections or Seven Deadly Sins, good or evil respectively.

Ultimo was first announced as an unnamed work between Stan Lee, the co-creator of iconic superhero titles such as Spider-Man and X-Men, and Hiroyuki Takei, the creator of Shaman King.

[5][6] According to Stan Lee in an audio interview,[7][8][9] he was called by Dream Ranch and JEA who said that they wanted him to create a manga with them, and that it was to be published by Shueisha.

[17] "Chapter: 0" was later adapted into English by Viz Media, and published in the September 2008 issue of their Shonen Jump manga anthology, which went on sale on August 5, 2008.

"This prologue of Ultimo doesn’t really offer enough to evaluate it, except to say that the dialogue and exposition are awkward and clunky enough to seem like the work of an amateur rather than a seasoned veteran" said Leroy Douresseaux.