Sky Atlantic (ch. 108, i think).
it's probably not as good as the penultiamte episode (The Blue Comet), but it's still great. The suspense over the latter half of series six is pretty rad.
watched this episode recently and remembered how fucking badass this ending was - http://www.youtube.com/watch?v=rBcbc8eWz6U - Leotardo was a brilliant character.
<customary mention of Pine Barrens being the best episode, usually from someone who hasn't watched about half of the other ones>
<custmary mention of actually preferring Breaking Bad> (no-one really prefers Breaking Bad, cheers)