in the fourth season of ITV's popular period drama,
succeeding Geraldine McEwan in the title role.
McKenzie guest starred in two Big Finish plays -
she voiced Rachel for No More Lies (2007), and
Florence for The Auntie Matter (2013).
Agatha Christie's fifty-sixth crime novel (her sixth
Marple mystery) was published in 1953, and this
adaptation was repeated again on ITV3 today.
The serial first aired in the UK in September 2009,
and featured fifteen Doctor Who cast and crew
- director Charles Palmer and Matthew Tabern (film editor) both worked on Smith and Jones, The Shakespeare Code, Human Nature and The Family of Blood too
- Rupert Graves (Lance Fortescue) played John Riddell (pictured) in Dinosaurs on a Spaceship
- Hattie Morahan (Elaine) voiced Helen Sinclair for Big Finish's Doom Coalition series
- Liz White (Jennifer) was Alice in The Snowmen, and voiced Genesta for The Last Adventure: The Brink of Death (BF, 2015)
- Kenneth Cranham (Rex Fortescue) voiced Tom Cardwell for Blood of the Daleks (BF, 2007)
- Ralf Little (Sergeant Pickford) voiced Guy Fawkes for The Gunpowder Plot, and has been cast as Steadfast in Series 10
- Chris Larkin (Wright) was Lynley in The Shakespeare Code
- Paul Brooke (Billingsley) voiced Toby for Year of the Pig (BF, 2006)
- Big Finish artist Rachel Atkins (Sister) voiced Queen Aethelfrid for The Lady of Mercia (2013), Sol for Gallifrey: Intervention Earth, Susannah for The New Adventures of Bernice Summerfield: The Triumph of Sutekh (both 2015), Juno for Maker of Demons, and Myla for The Age of Endurance (both 2016)
- Greg Bennett (Constable) was both a Sycorax Warrior and a UNIT Soldier in The Christmas Invasion, and an uncredited Guest in The Lazarus Experiment
- executive producer Damian Timmer made a cameo appearance in An Adventure in Space and Time as a Menoptera, and Nigel Squibbs was the sound mixer on that production too
- Sean Clayton was also the second assistant director on Dalek and Father's Day
- Tom Lucy was also the stunt co-ordinator on sixteen adventures (from Smith and Jones to The Next Doctor)
- series gaffer Gavin Walters was an electrician on Love & Monsters