[AChimp]

It's still in the airboat part, where you arrive at that hideout and they put a gun on your boat. After the vortigaunt finishes, you can keep clicking on him (use him) and he tells you about how there's a "greater master" and that Nihilanth was the lesser and that his species has been enslaved for eons.

Plus a bunch of weird philosophy stuff about people being inside you. :O

When he has nothing left to say, one of the humans will tell you to get moving.