Mary, thank you so much for keeping us informed of Dino news. These posts make me ridiculously happy. (also, I wanted to test out my new Strangercrombie badge. ohhhhh, ahhhhh)
@1, that is one hell of a plot summary. The closing moral is kind of dusty:
The Doctor reflects that people like Grover may have had good motivations in wanting to fight pollution and environmental degradation, but they took their schemes too far and endangered all mankind and its civilisation.
http://en.wikipedia.org/wiki/Invasion_of…
Following David Tennant would be hard for any actor, but I think Matt Smith is doing a really good job at it.
Except that Tom Baker was a raging alcoholic. Adric (Matthew Waterhouse) I think wrote a book about it.