Aside from Sean Bean and Patrick Stewart, it is the same like 4 people doing the entire game.
Does Skyrim have more than 4 voice actors?
@mandude: Do you mean first fully voice acted game? Because Morrowind had plenty of voice acting...
It had voices, but 99% of it was just reactions to the player. Almost all of the dialogue was text, even for story characters. In Oblivion, everything was voiced, which why everyone complain about there just being 10 voice actors in the game, 13 if you count Patrick Stewart, Sean Bean and Terance Stamp(not counting Shivering Isles).
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