10 Awesome Doctor Who Ideas That Nearly Happened

Without a doubt, the Doctor's deadliest foe is the Master. First introduced in 1971's Terror of the Autons, he was originally portrayed by Roger Delgado, who revelled in being Jon Pertwee's most hated enemy.

The Doctor-Master rivalry was intended to come to a head in the serial The Final Game, which was also set to be Pertwee's regeneration story. It would also include the shock revelation that the Master was in fact the Doctor's brother, before the Master would be killed off for good.

However, this story was never made due to a truly tragic event: while filming the miniseries Bell of Tibet in Turkey in 1973, Delgado was killed in a car crash.

This event shook everyone involved with Doctor Who, and as a result, this epic final battle between the Third Doctor and the Master sadly never got made.

It's a shame, because the brother reveal would've added a very interesting layer to the Doctor/Master conflict, and getting one more story with Delgado in the role would've been a real treat too.