Since Mighty Atom ended up being re-written more than ten times, either due to limits on size or duration in the magazines Astro Boy was published in, instead of just simply cutting or scaling down certain parts of the manga, Tezuka would completely redraw certain panels and sections of the manga to fit and flow better with the rest of the story. This means that it is hard to define what the most original, authentic version of the story is. Also, when the manga was to be made into the anime, further revisions had to be made, including a simplifying of the story to suit the less sophisticated, wider target audience the show was aiming to appeal to.