No, I'm not up to that yet, I've only got as far as the double ep where Anna first appears. I know, I'm going slow about it, but sometimes episodes just don't grab me, but I still feel beholden to watch them in proper order.

The eps I really want to see are The Rapture (4.20) and My Bloody Valentine (5.14). I want to see Jimmy, and the whole burger thing with Cas.

And from what I've read on the wiki I've found, the Whore of Babylon is season 5.