Forum:The human's first contact?

I barely remember the 10th Doctor saying something about this - he told an alien that "This planet first contact is after ... years". I can't remember the number, and I wonder - has there been any classic episode about the first contact? And if not, why? I mean, this is very important part of the people's history, so I guess that if not in an episode, it'll be at least in a book, a cannonical book, that's why it isn't made in to an episode :) Drwhobg 12:23, August 11, 2010 (UTC)