Where To Stream Doctor Who Season 17 Episode 21

The Doctor and Romana visit Chronotis, a retired Time Lord living in Cambridge, who admits that he's lost a book dating back to the time of Rassilon and needs their help to find it. In fact, he's accidentally lent it out to graduate student Chris Parsons, who soon realizes that this is an extraordinary text indeed. The book is also sought by the evil scientist Skagra, who has developed a sphere capable of drawing its victims' minds out of their bodies. Skagra needs the book to reach the Time...