 "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".According to Stan Lee in an audio interview, 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.Stan Lee stated that he has never made a comic about two robots of the same level of power, with one not being as heroic as the other.