Its the premise for a lot of films in general, which is why I think its dumb to cry 'rip off' when you see a film with a slightly similar story arch.
New comer finds himself in a new world surrounded by a new and unfamiliar culture, at first he's treated as an outsider but over time he earns the people's trust and becomes a hero.
Yeah you could pretty much insert that story arch into almost any type of film.
Romance, fantasy, action, blah blah blah.