Martians send eeeevil seed pods down to the surface of Earth. The seed pods, which would choke out all life on Earth, have only one weakness. Unfortunately for the Martians, that weakness is water.

And the Doctor and Zoe (and Jamie, I guess) triumph once more! ( )

http://nhw.livejournal.com/1031032.html#cutid4

For once I felt Dicks was trying a bit harder here, with a certain amount of characterisation and back-story for the (admittedly somewhat implausible) future Earth society and the hierarchy in charge of the T-Mat. The Doctor gets really trigger-happy with his wholesale slaughter of Ice Warriors at the end. One visual that I am happy to lose is the Ice Warrior leader Slaar, who reminds me too much of Rick Moranis as Dark Helmet in Space Balls. ( )