Doras is a powerful antagonist in the Kamen Rider series, specifically appearing as the main villain in the movie 'Shin Kamen Rider: Prologue.' Created as a monstrous fusion of bio-technology and living tissue, Doras serves as the final adversary for the protagonist, Shin Kazamatsuri. With a fearsome appearance and remarkable regenerative abilities, Doras represents the dark ambitions of human experimentation, challenging the hero both physically and morally throughout the story.