This week we have the second part of what is known as The Master Trilogy, and also the final episode of Tom Baker’s Doctor. The four-parter was written by Christopher H. Bidmead and ran from 28 February to 21 March, 1981.

It also sees the introduction of another Companion to the TARDIS. Teagan (Janet Fielding) an airline hostess joins Adric (Matthew Waterhouse) and Nyssa (Sarah Sutton) after she wanders into the TARDIS.

The Doctor, along with his increasingly full TARDIS, travels to the planet Logopolis where the Master (Anthony Ainley) has a plan that may spell certain doom for the entire universe!

And through it all, there is a strange figure watching every move the Doctor is making.

The idea of the cloister bell is introduced in this episode, shortly before it goes off, signifying an emergency, while the Doctor is discussing with Adric the idea of fixing the ship’s chameleon circuit.

Nyssa gets caught up in events when she’s delivered to Logopolis, intent on finding the Master and learning what happened to her father. Meanwhile, Teagan laments the need to get home, while trying to help out as best as she can, and in typical fashion, The Master almost incapacitates the Doctor by shrinking the TARDIS to a minute size, with the Doctor trapped inside.

An issue, the Doctor and his Companions easily take care of. In fact,  the whole story seems like a bit of a let-down in terms of a Doctor’s final story. There’s nothing you don’t expect to happen here – the Master tries to use Nyssa, looking like her father, Teagan just wants to get back to Earth and just pick up with her life, and new job, and Adric wants to see Gallifrey,

The Master plans to use a tower on Logopolis, a world filled with mathematicians, to take over or destroy the universe, depends on the day of the week.

The Doctor saves the day, but then falls from the tower, sacrificing himself for the planet and, of course, the whole of the universe, but this strange figure who has been watching him for the entire adventure, and even delivered Nyssa to Logopolis to join the Doctor, is, in fact, the Doctor.

As the episode draws to a close, the two forms of the Doctor become one as he regenerates and becomes Doctor Number Five (Peter Davison).

While I think at this point, we were long overdue for a regeneration, I do wish they had given Baker a stronger exit than this. But, it’s happened now, and starting next week we begin our journeys with a new Doctor in the TARDIS as the Time Lord travels to the planet Castrovalva.