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The family guy, counselor Troy vid.

Did they use any of the actual TNG actors for that bit...or were they all impersonators?

I believe it's all impersonated.

not all of it, but a lot of it is... patrick stewart, for instance, is impersonated.
adam west however, is not impersonated.

Cast - http://familyguy.neoseeker.com/family_guy_volume_4_season_5/Movie/pages/cast_guide/
Guest Stars - http://familyguy.neoseeker.com/family_guy_volume_4_season_5/Movie/pages/guest_stars/

Sounded like all the original actors' voices to me.
Not every actor wants their name showing up in the credits. It's their choice.

Adam West is awesome, yes, I was just referring to this clip, though.

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Actually Patrick Stewart is NOT impersonated: look at #5 and #8 on his list. He's been on American Dad and Family Guy quite a lot.

http://www.imdb.com/name/nm0001772/

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