10 Insane Doctor Who Episodes That Almost Happened
7. The Doctor's Son
Loneliness is one of the main reasons why the Doctor constantly picks up new companions. After all, it's not like Thirteen can just return to Gallifrey and hang out with some buddies in the local Time Lord cinema.
The Doctor doesn't have a proper family either, even though we've bumped into a few relatives (his granddaughter Susan, his "daughter" Jenny) over the years. And in the early 1960s... we almost bumped into one more.
The First Doctor himself, William Hartnell, once put forth a story idea in which the Doctor comes face-to-face with his evil time-travelling son. Hartnell even wanted to play both roles, meaning that the Doctor and his son would've looked practically identical.
If it had been made, The Son of Doctor Who (a possible title for the serial) would likely have aired sometime in Hartnell's second or third series, but the idea was abandoned early on, and the Doctor's son never made it to the screen.