The Poison Sky
- Episode aired May 30, 2008
- TV-PG
- 45m
With planet Earth choking under the poison sky, the Doctor must stop the Sontarans' threat to the planet.With planet Earth choking under the poison sky, the Doctor must stop the Sontarans' threat to the planet.With planet Earth choking under the poison sky, the Doctor must stop the Sontarans' threat to the planet.