 The VHS/DVD includes a cut scene which better explains the existance of  Mewtwo, including a reference to Jurassic Park. This scene is played before  the actual movie. (And makes the opening of the movie much more  understandable). In the following "straight to video" DVD, "Pokemon : Mewtwo  Returns" which was a direct sequel to this film, there is a longer version of  this introduction introducing a young girl who appears to be the scientists  daughter, who teaches Mewtwo a little bit about life. However, the little  girl passes away when Mewtwo was still a little baby Pokemon, making his  brainwaves violent, forcing the Scientists to rid his mind of his knowledge  of the little girl, explaining his grainy memory.