The Transformers: Hearts of Steel is a comic book miniseries published by IDW Publishing. It was intended to be part of a comic book line titled The Transformers: Evolutions, following the same idea of DC Comics' Elseworlds series. Each series was to create an alternative reality: a continuity in a different time era during which the Transformers would exist. In other words, the Transformers can exist at places and at points in time that would not be possible in the current 'IDW-verse'. As of 2007, only the Hearts of Steel series was produced, which is set in the United States during the Industrial Revolution. The rest of the series was cancelled, likely due to poor sales and IDW had announced that there would be no more Evolutions series until after the 2007 movie, as Hasbro did not want to make things confusing with more alternate universe tales.