William Hartnell was an English actor best known for his role as the First Doctor in the iconic British television series Doctor Who. He portrayed the character from 1963 to 1966, becoming a beloved figure in science fiction. Hartnell's performance helped establish the show's unique blend of adventure and imagination. Before Doctor Who, Hartnell had a successful career in film and television, appearing in various roles during the 1940s and 1950s. His distinctive voice and commanding presence made him a popular choice for character roles. Hartnell's legacy continues to influence the Doctor Who franchise and its many iterations.