Archie (species)

Archies are alien lifeforms that live in pairs, one inside the other. When they become separated they can cause great chaos. On Earth an Archie adopted the form of a school boy to study and learn about Earth. But when the two became separated as a result of a sneeze, the school and streets of Leeds became covered in snot with a giant snot monster on the loose. The Doctor reduced the snot monster in size and returned it to Archies nose, reuniting the Archies. (COMIC: The Runaway Bogey)