I was watching SG-1's Season 6 episode Smoke and Mirrors on the TV yesterday and saw a very familiar face. The Area 51 scientist who is hilariously intimidated by a silent Teal'c is played by none other than a very young-looking Peter Kelamis, aka Adam Brody. Kelamis also played one of the two commentators in Season 7's Space Race.
Maybe the characters are twins