The Poison Sky

192b – "The Poison Sky"
192b – "The Poison Sky"
Doctor Who episode
Cast
	Doctor David Tennant – Tenth Doctor;
	Companions Catherine Tate – Donna Noble; Freema Agyeman – Martha Jones / Clone Martha;
	Others Christopher Ryan – General Staal; Rupert Holliday-Evans – Colonel Mace; Bridget Hodson – Captain Price; Dan Starkey – Commander Skorr; Bernard Cribbins – Wilfred Mott; Jacqueline King – Sylvia Noble; Ryan Sampson – Luke Rattigan; Christian Cooke – Ross Jenkins; Clive Standen – Private Harris; Wesley Theobald – Private Gray[broken anchor]; Meryl Fernandes – Female Student; Leeshon Alexander – Male Student; Kirsty Wark – Herself; Lachele Carl – US Newsreader; Jack Steed – Lieutenant Skree;
Production
Directed by	Douglas Mackinnon
Written by	Helen Raynor
Script editor	Nikki Smith
Produced by	Susie Liggat
Executive producer(s)	Russell T Davies; Julie Gardner; Phil Collinson;
Music by	Murray Gold
Production code	4.5
Series	Series 4
Running time	2nd of 2-part story, 45 minutes
First broadcast	3 May 2008
Chronology
← Preceded by; "The Sontaran Stratagem"	Followed by →; "The Doctor's Daughter"
	List of episodes (2005–present)

"The Poison Sky" is the fifth episode of the fourth series of British science fiction television series Doctor Who. It was broadcast on BBC One on 3 May 2008. The episode features both former companion Martha Jones and the alien Sontarans. It is the second of a two-part story; the first part, "The Sontaran Stratagem", was broadcast on 26 April.

Continuing from the previous episode, "The Poison Sky" reveals the poisonous gas that is choking the Earth's atmosphere is intended as a way of feeding new batches of Sontaran clones that would be bred on Earth for war.

^ "War on Earth!". Doctor Who Magazine. No. 394. 3 April 2008. pp. 12–13.

[dwmpreview-1] "War on Earth!". Doctor Who Magazine. No. 394. 3 April 2008. pp. 12–13.

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