Martin Landau. He played a Roman military officer in Cleopatra, which was shown on Channel 4 last Friday and I tested my new PVR on it; but I'm more used to seeing him in Mission: Impossible as the master of disguise Rollin Hand. Hence, my instinct was not "there goes a Roman officer who happens to look like Rollin Hand", but "hey, that's Rollin Hand disguised as a Roman!"

(Well, Rollin Hand is a master of disguise according to the script. What that usually seems to mean in practical terms is that a startling number of the people the IMF team finds a need to impersonate in the first place turn out to be played by Martin Landau. :-)

And when that fails, there's always Latex Perfection (http://tvtropes.org/pmwiki/pmwiki.php/Main/LatexPerfection) to fall back on. Just chisel that jawbone down to size...