Oh, that's who that was. I thought the guy looked vaguely familiar, and the name Brett Cullen is vaguely familiar too. But he's one of those "Hey, it's, uhh, that guy" actors for me. Checking his IMDb profile, I see he's been in a number of things I've seen (like "The Phenom" on The Incredible Hulk
and "Meridian" on DS9), but he's never been a name or face that really stuck in my memory.