Sorry, I can't recall who it was either. The IMDB listing for the Fantastic Four Marvel Action Hour from 1994 lists an actor named Simon Templeman, who in a strange coinky dink had a small recurring role on "Charmed" as the Angel of Death. He did appear in one episode when Julian McMahon was in the cast but I think all his scenes where with Prue (Shannon Doherty). Truthfully, I thought his voice was a bit over the top if it is the same guy who did the one with Daredevil and the FF, which is included as a bonus extra on a Spiderman/Davedevil DVD I have.
I really disagree with those who want a deep voice - - to me it's a case of "been there, done that" with James Earl Jones as the voice actor for Darth Vader. Jeremy Irons would have the right kind of voice but physically I don't see him in the part. There's an actor that is better known for his role as Commander Dreyfuss, the original Inspector Clousseau's boss from the Peter Sellers films, that I thought had the right voice. His name is Herbert Lom and he's done mostly British films but he was born in Czechoslovakia. So his voice has this accent that you can't quite call entirely British nor Slavic. He also did a few turns as a villain in "El Cid" with Charlton Heston -- ironically you never saw his face because his part as a Moor only showed his eyes beneath the bernoose. He also did a few Hammer Horror films (again masked in Hammer's "Phantom of the Opera"!) and played Captain Nemo.
Here is a tribute page on his career as a character actor.
http://www.movieactors.com/characters/lom.htm