Doomcloud (comic story)

Summary
UNIT is in a state of panic. A mysterious spacecraft orbits Earth, waiting to unleash a deadly virus on humanity.

The Doctor and new friend Sarah Jane Smith arrive on Earth to find the planet facing its greatest threat. Can the Doctor save Earth from a deadly virus? Just what are the creatures declaring genocide upon humanity?

Characters

 * Third Doctor
 * Sarah-Jane Smith
 * Brigadier Lethbridge Stewart
 * Sergeant Benton

Reprint

 * Fourth Doctor
 * Joan Brown
 * General Maxwell-Lennon

Continuity
to be added