Name – Sally Jacobs
Species – Human
Planet – Earth
Temperament – Efficient.
Appearances – The Christmas Invasion

Sally Jacobs works for U.N.I.T. as a computer technician. She is the one who shows Harriet the alien ship heading for Earth. She is later affected by the blood control and walks up to the roof of the Tower of London with all the other A Positives in U.N.I.T. When the blood control is cancelled by The Doctor she steps back from the edge safely.