I’m guessing it would be Alan Rickman or John Ratzenberger.
No, really. Follow with me here. Rickman has been in every Harry Potter movie, plus a few others that made money (Die Hard, Robin Hood, etc) while Ratzenberger has been in every singe Pixar movie to date (and has a part in, at least, the next one coming out: Cars 2).
So I think it’s close: US totals, I think, would favor Ratzenberger and Worldwide totals would favor Rickman. I think. I’m really too lazy to figure it all out.
Any other actors you can think of that even come close to these two?
(and even if someone was in both Titanic and Avatar, I don’t think they’d be close to these two guys)