Green alien (The Big, Blue Box)

A species of green aliens were from the neighbouring planet to a similar species with whom they were at war. They came to Earth to attempt to acquire Douglas Henderson, who was unknowingly a living weapon that could be used to destroy the other species.

However, when Henderson and the Tenth Doctor were teleported to their ship, Henderson activated himself, disabling both fleets. The Doctor left to tow the aliens back to their home planets. (COMIC: The Big, Blue Box)