Plague World

Plague World was a comic story from the Doctor Who Annual Vol 1 16 (1982) published by World Distributors.

The plot
The Doctor, Adric and K9 arrive on the planet Publius, which is in the grip of a lethal plague which only the planet's ruler, Bemar, was immune to. Bemar was actually a servant of the insectoid Druden, who were feeding on the planet's population, but with the assistance of a local named Kidson (who sacrificed himself to destroy the Druden) our heroes were able to end the threat, curing the plague and seemingly killing Bemar.