This is part 1 of a 2 part animated version of the seminal Frank Miller story that redefined Batman for the 90's. It's influence helped launch Image Comics. The trailer I viewed is true to the original story with the minor difference of not having the voice over by Batman. In an interview Bruce Timm explained that because this is such an important Batman story, the production team felt it needed to be done completely. That is why it is being released in 2 parts, at approximately 160 minutes total running time. After watching Batman : Year One, (the other landmark Frank Miller written Batman story), and seeing how closely Bruce Timm and his team stayed to the original source material, I have no doubt these 2 parts will be amazing.