Nurse (School Reunion)

From Tardis Wiki, the free Doctor Who reference

A Krillitane, a member of the Chosen Few, serving under Brother Lassar disguised herself as the school nurse of Deffry Vale High School in order to crack the Skasis Paradigm. When Nina got a headache in class and didn't have parents to be sent home to, the nurse sent her to the headmaster, Brother Lassar's, office. Claiming to see why the nurse sent her there, Lassar took Nina into office and ate her. The nurse was killed when K9 Mark III exploded drums of Krillitane oil with his laser. (TV: School Reunion)