Druden were a race of insectoids.
Druden were green, had long antennas, black eyes and yellow pincers on their mandibles.
Druden invaded the planet Publius and hid in a lair in the Forbidden Valley on the planet. They tried to spread a plague to kill all the humans humans; they would feed the corpses to their young. The Fourth Doctor and Kidson stopped them with Kidson sacrificing himself by crashing his Starto-Cruiser into their lair which exploded and caused all the rocks to cave in and kill them. (COMIC: Plague World)