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Archies were alien lifeforms that lived in pairs, one inside the other. When they became separated they could 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 Eleventh Doctor reduced the snot monster in size and returned it to Archie's nose, reuniting the Archies. (COMIC: The Runaway Bogey)