It's likely you're thinking of the animated film "Silver Surfer" (1998), which was part of the Marvel Animated Universe.
The voice cast for the movie included:
* Rob Paulsen as Norrin Radd/Silver Surfer
* Michael Ironside as Galactus
* Jennifer Hale as Shalla-Bal
* Ed Asner as the Watcher
* Mark Hamill as Thanos
It's important to note that a "Silver Surfer" movie was originally planned for a 2008 release, but ultimately never materialized.