A character, usually a somewhat unassuming one, is inserted into an unusual situation or world. But rather than having difficulty adjusting, the character possesses knowledge, a personality type or physical prowess that allows him to leap up the social ladder to a far higher station than the one he had back home.
See also The Unfrozen Caveman Lawyer. Can also be a Mighty Whitey (if a European [...] [tvtropes.org]