For a character who spends most of his time fixing wrongs, rooting for the small guy, and drifting in and out of lives/towns/planets, it's surprising that the Doctor hasn't had more cowboy adventures.
In fact, there's only ever been one real Who Western to date - and while 1966's The Gunfighters wasn't exactly what you'd call a classic (the common - and untrue - pop culture myth goes that it had the lowest rating of any Doctor Who story ever), A Town Called Mercy proves that the Doctor suits the genre as well as he rocks a Stetson.
