Information
Writer: Helen Raynor
Director: Douglas MacKinnon
Script Editor: Nikki Smith
Producer: Suzie Liggat
Executive Producer(s): Russell T. Davies, Julie Gardner, Phil Collinson
Originally Broadcast: 3rd May 2008
Duration: 45 mins
Viewing Figures (in millions): 6.53m
Production Code: 4.5
Monsters/Villains: Sontarans, Luke Rattigan
Year Set: 2009
Location: Earth/Above Earth
Synopsis
The Sontarans activate their masterplan and begin to choke the whole of planet Earth.
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
The Doctor – David Tennant
Donna Noble – Catherine Tate
Martha Jones – Freema Agyeman
Rose Tyler – Billie Piper
Wilfred Mott - Bernard Cribbins
Sylvia Noble - Jacqueline King
Luke Rattigan - Ryan Sampson
Colonel Mace - Rupert Holliday Evans
General Staal - Christopher Ryan
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
Herself - Kirsty Wark
US Newsreader - Lachele Carl
Sontarans created by Robert Holmes
Monster File: The Sontarans – Part 2
Home Planet: Sontar
Life Form: Humanoid
In 2009, the Sontarans were losing the war against the Rutans. To counter this, the Tenth Sontaran Battle Fleet (led by General Staal) made plans for invasion of Earth, and carried them out with the help of Luke Rattigan. The Sontarans used a form of hypnosis on the workers of the ATMOS factory, forcing them to start shipping out devices that contained gases poisonous to humans, contained inside plates attached to the Sat-navs they sold. When the Doctor interfered with their plans, they attempted to kill him by using the plate on a UNIT car to drive it into a river. It failed, but this was unknown to them until the Doctor began fiddling with a plate, causing it to become active. The Sontarans activated all the plates in every car containing one. The gas was released into the air, choking people around it. It also deadlocked the car preventing escape from inside. They cloned Martha, and used her and her security pass to help. The Sontarans plans were revealed: they actually wanted to change the Earth into a cloning planet to make a billion more Sontarans. The clone Martha died when the real Martha became conscious again. The Sontarans started to realise they were being defeated, when the Valiant and UNIT started destroying part of the ATMOS factory, with Sontarans still inside. The Doctor got rid of the toxic smoke by using an atmospheric converter to burn up the gas in the atmosphere. The Doctor nearly blew up the Sontaran ship while still inside, and giving the aliens a chance, but they did not mind dying, and they knew the Doctor would not do it. Rattigan swapped places, using a teleport and the fleet was destroyed.
Preceded by: The Sontaran Stratagem - Followed by: The Doctor's Daughter
