The Poison Sky (2) Doctor Who : Season 4 Episode 5
TV-PG BBC One 45m
Aired: May 3rd, 2008 @ 6:30 PM EST on BBC One
The Sontarans continue their evil plot and begin to "choke" the Earth. The Doctor and Donna, now teamed with Martha have to stop them! Can they save Earth before it's too late?
