She appeared in a modernised TV adaptation of "Frankenstein". Her first pregnancy forced her to pull out of "Harry Potter and the Order of the Phoenix" (2007), in which she had been cast as Bellatrix Lestrange (she was replaced by Helena Bonham Carter). McCrory was later cast as Bellatrix's sister Narcissa Malfoy in "Harry Potter and the Half-Blood Prince", released in July 2009. McCrory reprised her role in the final films, "Harry Potter and the Deathly Hallows – Part 1" and "Harry Potter and the Deathly Hallows – Part 2"; McCrory's performance was well received by fans of the books. She also played the principal villain role of Rosanna Calvierri in the episode "The Vampires of Venice" of the BBC television series "Doctor Who".