Season 4, Episode 5 The Poison Sky
First Aired: May 30, 2008
Poisonous gas threatens the people of Earth as the Sontarans attempt to convert the planet's atmosphere to suit their needs. Martha Jones: Freema Agyeman.
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- Premiered: March 26, 2005
- Rating: TV-PG
- Premise: Following the adventures of a time-traveling alien called "The Doctor" and his human companions as they deal with crises set on Earth and other worlds. (more)