Brayley

 was a human biology teacher. Miss Brayley found and took care of a tiny and cute Drokkvid, which after eating a sandwich left in the draw began to eat up everything. When the creature grew to giant proposions she assisted the Eleventh Doctor and Clara by showing them the compost heap which was instrumental to defeat the Drokkvid, reverting it back to a more manageable size. (COMIC: Teacher's Pet)