Tharlot

Tharlot worked with Silas Wain for the Pantheon Elite to save the universe. However, he was secretly working against them, wanting to rule the universe. When he first met the Tenth Doctor, he claimed to be the last survivor of the planet Omphalos. Tharlot obtained a pan-dimensional sonic gun to do so, but needed to join the Doctor's sonic screwdriver with the gun to achieve his goal. However, the Doctor used his screwdriver to destroy the gun, and Tharlot along with it. (COMIC: Agent Provocateur)