Hugh Laurie is also in the final episode of the second series of Blackadder, in which he plays a German particularly skilled in disguises.
Fanon might also wonder whether Prince Ludwig The Indestructible (that character) also was in 'disguise', in-universe, as an drinking chum of 'Bladders' in the prior episode with the Whiteadders/Drinking party plot.
Apart from the fact that it would be a bold master of disguise who disguises himself as a slightly more mundane version of himself. Instead of a sheep.
But both are one-shot characters, unlike his Georges. Perhaps Ludwig is more House-ish, but a
different different accent, while the drinker arguably isn't even one of the most outstanding 'drunken drunker', consider it more a rewatch-bonus. Ludwig 'eats the scenery' quite a lot (not quite so much as Lord Flashheart... but that's practically impossible to do!), so yes, B2 is already worth watching (IMO), but the finale
is a particular treat for any Laurie-spotters out there.
(For those with access to BBC Sounds, or equivalent, him and Fry (and others) have recently been on Radio 4 Extra, with the old "Saturday Night Fry" series. Might be that only the last two or three are still 'available', if they're on the usual four-week backlist. Anyway, it's him more in his general George (prince or lieutenant) 'default', amidst the typical Fry-And-Laurie intellectual chaos.)
Ok, I'm going to now have to dig out the Blackadder VHSs and rewatch them, so as to make this not as off-topic as I may have sent it.