The Poison Sky

By Mark
Episode Title: The Poison Sky

Duration: 44 minutes and 39 seconds

Written by: Helen Raynor

Directed by: Douglas Mackinnon

Transmission Date: 3rd May 2008

Ratings: 6.5 million

Synopsis: The Sontarans activate their masterplan and begin to choke the whole of planet Earth, as Russell T Davies’s Bafta Award-winning time-travelling drama continues. UNIT is left defenceless, with a traitor in their ranks. And as interplanetary war edges closer, the Doctor has to fight to keep both Martha and Donna alive – but will he have to make the ultimate sacrifice?

Cast List: The Doctor - David Tennant
Donna Noble - Catherine Tate
Martha Jones - Freema Agyeman
Rose Tyler - Billie Piper
Wilfred Mott - Bernard Cribbins
Sylvia Noble - Jacqueline King
General Staal - Christopher Ryan
Commander Skorr - Dan Starkey
Colonel Mace - Rupert Holliday Evans
Luke Rattigan - Ryan Sampson
Ross Jenkins - Christian Cooke
Captain Price - Biddy Hodson (as "Bridget Hodgson")
Private Harris - Clive Standen
Private Gray - Wesley Theobald
Newsreader - Kirsty Wark
Mal Loup - Lachele Carl