Title: The Keys of Marinus
Writer: Terry Nation
Original Broadcast Date: 11 April 1964 - 16 May 1964
The Doctor, Ian, Barbara and Susan arrive on an island, with beaches of glass, a sea of acid, and a large pyramid holding what remains of a great civilization conditioned by machine, the Conscience of Marinus. Arbitan, the key holder of the conscience requests their help in restoring the power, to search for the missing keys of Marinus. Attempting this task hundreds have failed before them, the team begin their journey, attempting to restore these keys before the Voord take control.
Adopting an unusual quest format, The Keys of Marinus, Terry Nation's second story is one mostly disliked by fans, but for some reason I absolutely adore it. There is something so charming and genuinely fun about the constantly changing setting and characters that sets it towards the high end of my favourite Hartnell episodes. Sure the sets are rubbish a lot of the time and the Voord look like mimes in suits, but The Keys of Marinus is at its best when a fun romp for the TARDIS team.
The first two episodes are the low point of the serial, but are still generally good episodes. The atmosphere is well done and there is something strikingly beautiful about the glass pyramid surrounded by the sea of acid. The second episode is a nice introduction into Marinus' other lands and Barbara is excellent (yet again) saving the day from brains in glass jars (which is one of the negatives of the story). The third episode separates the team, with the Doctor jumping two locations ahead so Hartnell could take two weeks off for a holiday. His absence was noted but the team didn't feel lacking due to extra cast members and how the plot kept throwing up new ideas.
The final two episodes involve a who-dunnit (Doctor Who's first) mystery which I felt was well done and in which Susan proved herself useful (one of the rare times). Hartnell also had a lovely scene involving him standing as attorney in court. This mystery unfolded rather cleverly that allowed audiences to piece bits together but not understand right away. The story was also wrapped up neatly with all loose ends tied up.
Overall I feel The Keys of Marinus is a hugely underrated story that, while it has flaws, offers much more in a largely ambitious plot full of variety, that while is constantly u-turned with new ideas allows breathing space for the characters to develop and come into their own roles.
9/10