Earthling

Earthling was the name given to an inhabitant of the planet Earth.

The Sontaran Marshal, believing the Fourth Doctor to be a human from Earth, addressed the Doctor as "Earthling". (TV: The Sontaran Experiment)

The Fifth Doctor, while explaining to Monarch that not all of his party were from Earth, described his human companion Tegan Jovanka as an Earthling. The Doctor later referred to the humans on board Monarch's ship as Earthlings. (TV: Four to Doomsday) The Doctor again introduced Tegan as an Earthling to the Cybermen, who themselves refered to humans as such during their conflict in 2526. (TV: Earthshock)

Shortly before the Toclafane invasion of Earth and the start of the Year That Never Was, broadcast a message to the humans of Earth, saying, "So, Earthlings, basically, end of the world. Here come the drums!" (TV: The Sound of Drums)

Enlisting the services of a footman to retrieve the Doctor's TARDIS in Victorian London, the Sontaran Strax addressed him as "Earthling scum." (TV: Deep Breath)