4.05: The Poison Sky

This is: Doctor Who: Series 4 - Episode 5

Title: The Poison Sky

Mon/Vil: General Staal, Commader Skorr, Sontarans, Luke Rattigan, Clone Martha & Hypnotised UNIT Soldiers

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?

Writer: Helen Raynor

Director: Douglas Mackinnon

Producer: Susie Liggat

First Broadcast: 3rd May 2008

Ratings: 6.5 Million

Duration: 44.39

Cast: Tenth Doctor - David Tennant
Donna Noble - Catherine Tate
Martha Jones/ Clone Martha - Freema Agyeman
Wilfred Mott - Bernard Cribbins
Sylvia Noble - Jacqueline King
Luke Rattigan - Ryan Sampson
Colonel Mace - Rupert Holliday Evans
Sontaran General Staal - Christopher Ryan
Sontaran Commander Skorr - Dan Starkey
Private Harris - Clive Standen
Private Gray - Wesley Theobald
Ross Jenkins - Christian Cooke
Female Student - Meryl Fernandes
Male Student - Leeshon Alexander
Captain Price - Bridget Hodson
Kirsty Wark - Herself
U.S Newsreader - Lachele Carl