This Week in Australia

The Poison Sky (Season 4 Episode 5)
Last updated 02 January 2017
8:30am-9:25am AEDT (21:30 GMT) < > « »
BBC UKTV (adverts during broadcast)

Featuring: David Tennant, Freema Agyeman, Bernard Cribbins, Catherine Tate, Jacqueline King, Christopher Ryan, Ryan Sampson
The Sontarans activate their masterplan and begin to choke the entire 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.
Synopsis Source: BBC Australia
Broadcast Source: UKTV