Within the series’ narrative, the Doctor is a centuries-old alien Time Lord from the planet Gallifrey who travels in time and space in his TARDIS, frequently with companions. When the Doctor is critically injured, he can regenerate his body; in doing so, his physical appearance and personality change. Hartnell’s Doctor is the Doctor’s “original” form. The regeneration plot device was introduced when Hartnell needed to leave the series, and consequently has extended the life of the show for many years.
Taking it back to the old school. I actually watched the first ever season of Doctor Who from 1964. The story line was VERY different from the Doctor I know and love. Still, it was good to see where it all started.