 Martha soon reacts with surprise and possible offence to William Shakespeare's use of Elizabethan terms for black people such as "blackamoor" and "ethiop".For a moment, she thinks these terms could be racist (the Doctor quips that it is "political correctness gone mad"), but realises Shakespeare is actually enamoured of her.At the end of the episode, he calls her his "Dark Lady", the name given to the woman the real Shakespeare referred to in a number of Shakespeare's sonnets; by implication, Martha is the Dark Lady.