Doctor Who: The Invasion of Time

The Doctor returns to Gallifrey, claims his rights and is inaugurated President. It soon turns out that he has led a group of aliens called Vardans to the planet to eradicate them completely. After they are destroyed, the Sontarans take their opportunity and follow them in their invasion until they are destroyed by the Doctor.

Doctor Who: The Android Invasion

The Doctor and Sarah return to Earth in the present day to find a strangely deserted village and woods stalked by white-clad figures.

Tishoo

It is the mid-1980s. The economy has not improved. For 17 years Professor Frank Merrick has been ensconced in a research lab of a provincial university working on a cure for the common cold. He is very near success. Can he avoid becoming yet another victim of the eternal cutbacks?