The product is the comic book "Dr. Horrible #1" published by Dark Horse Comics in 2009. Written by Zack Whedon and illustrated by Joelle Jones, this single issue features the character Dark Horse and has a color style. The cover art was done by Kristian Donaldson, and it falls under the tradition of US Comics. This one-shot comic is part of the series titled "Dr. Horrible" and is a must-have for fans of the series or collectors of comic books.