Shada

The Doctor and Romana are summoned to Cambridge by Professor Chronotis. The Professor, a retired Time Lord, asks the Doctor to return a book he borrowed from the Panopticon Archive on Gallifrey. The book, The Worshipful and Ancient Law of Gallifrey, is actually an important artifact that contains clues to the location of Shada, the secret Time Lord prison planet. But returning the book won't be easy because, 1. the Professor accidentally loaned the book out to a colleague and 2. there are other parties who mean to get the book for themselves. Shada, famously, was never completed. A technician strike halted filming partway through and the BBC decided not to finish filming after the strike ended. Some of the footage from the serial was later used in The Five Doctors, after Tom Baker declined to appear in the special. Fans first got to see the remaining footage in 1992, when a reconstruction of the serial was released on VHS. In 2017, Shada was released on DVD with the missing scenes recreated via animation. And in 2021, the serial was updated again for the Blu-ray release. While it's fantastic that Shada was eventually released, it's not exactly a hidden treasure. Of all the Doctor Who scripts credited to Douglas Adams, Shada might be the worst one. The characters aren't particularly interesting, there aren't many jokes and the plot isn't very compelling.

Rating: You've got a lot to unlearn%