Kinda

The TARDIS visits the planet Deva Loka, where all Tegan becomes possessed by an evil force known as the Mara.

Four To Doomsday

The Fifth Doctor and his companions find themselves on a spaceship heading for Earth, populated by humans from different eras and three Urbankans: Monarch, Persuasion and Enlightenment. However, the aliens have sketchy motives for heading to Earth – will the Doctor be able to stop them in time?

Castrovalva

The Doctor’s new regeneration has proved more unstable than previously, and looks to recuperate with the help of Tegan and Nyssa. Meanwhile, Adric has been captured by the Master, who has set a recursive trap designed to destroy the new Doctor’s mind.