Castrovalva

Castrovalva is a serial in the British science fiction television series Doctor Who, which originally aired in four twice-weekly parts from January 4 to January 12, 1982

It was the first full serial to feature Peter Davison in the starring role. Tom Baker makes his final appearance as the Doctor in the teaser before the opening credits, which recapped the ending of his final story Logopolis.

Synopsis

The freshly regenerated Doctor is in a vulnerable state, and the Master has escaped after his exploits in Logopolis. He has prepared a trap for the Doctor and his companions in the city of Castrovalva.

Notes

1. Castrovalva is the name of a piece by the dutch graphic artist M.C. Escher, and the design of the city in this serial reflects the impossible nature of the work.