Bradley played Hartnell’s Doctor once before, in the An Adventure in Space and Time TV movie all about the story of Doctor Who’s creation.
The First Doctor was originally played by William Hartnell back in the 1960s, and Hartnell has since passed away.
Luckily, Mirror reports that Doctor Who won’t just bring the First Doctor back for a few scenes that could be cobbled together from existing footage of Hartnell as the Doctor; the First Doctor will be played by David Bradley of Harry Potter and Game of Thrones.
The resemblance between Bradley and Hartnell was pretty uncanny, so he’d be the perfect person to bring the original Doctor back to the small screen for one more go.