|Also known as:||Sol III|
|First Appearance/Mention:||A Timeless Man|
Earth is the third planet of the Sol star system, home to native intelligent species Homo sapiens and Saurornithoides sapiens. Since the Inspector embarked on his mission here during his first incarnation, he has grown to like this world and frequently visits. Most of his associates come from here, such as Mary Sue Brown, Jeffrey Wells, Lily Taylor, Constable Reggie Wigglesworth, and Rory Williams.
The planet was the target of so many alien threats, e.g. the Blorgons, the Circuit-Chaps, the Ocean Demons, the Rostraans, the Slythins, and Sulphur Soldiers, that in the late 20th century its governments banded together to found the Extraterrestrial Overwatch Police to defend against them when the Inspector was not available.
In the 24th and 25th centuries, Earth would embark on becoming a major inter-galactic power in its own right, colonising (and invading) numerous other worlds. During later periods of its dominance, beginning with the Terran Federation, Earth was the centre of vast empires and hegemonies, with humans expanding into the furthest reaches of the universe.