Don't be alone, Doctor," Amy Pond tells the eleventh Doctor in "The Angels Take Manhattan," and of course the irony is that in one sense the Doctor is always alone-a Gallifreyan whose regenerative powers mean he will outlast nearly everyone near and dear to him-while at the same time he is rarely without one or more trusted companion by his side. This is a book about those companions, those fortunate few who accompany him on his journeys through space and time on, to quote the ninth Doctor-"the trip of a lifetime." The editors of The Villains of Doctor Who return with a new anthology of essays to Donna Noble, Sarah Jane Smith, Rose Tyler, Wilfred Mott, Chang Lee, Clara Oswald, and more.