Jilly Kitzinger is a fictional character in the science fiction series Torchwood, portrayed by American actress Lauren Ambrose. The character was promoted as one of five new main characters to join Torchwood in its fourth series, (2011), as part of a new co-production between Torchwoods British network, BBC One, and its American financiers on US premium television network Starz. Ambrose appears in seven of the ten episodes, and is credited as a "special guest star" throughout. Whilst reaction to the serial was mixed, Ambrose' portrayal was often singled out by critics for particular praise and in 2012 she received a Saturn Award nomination for Best Supporting Actress on Television.