Arbitan (species)

The Marinusians are a Near-Human species native to Marinus. They were pacifists until the evil Voords forced them to fight. They conquered the Voords by fixing the Conscience of Marinus. (DW: The Keys of Marinus)

Behind the scenes
The Marinusians are the first species physically identical to Humans to appear in Doctor Who. They aren't the first near-Humans though, they are the Time Lords.