Jared Padalecki and Genevieve Cortese, <I>Supernatural</i> Jared Padalecki and Genevieve Cortese, Supernatural

For the few of you who have recovered from "When the Levee Breaks," it's time now to start prepping for Supernatural's Season 4 finale. And here is a sneak peek.

Airing May 14, "Lucifer Rising" finds the brothers nearing the end of their long-dreaded (by fans) collision course. Here is the official logline for the season-ender:

"Dealing with the aftermath of a newly created, crushing rift in their relationship, Sam and Dean each race down a different path to try to stop the impending apocalypse from happening. Guest stars include Jim Beaver as Bobby, Genevieve Cortese as Ruby, Misha Collins as Castiel, Katherine Boecher as Lilith, Kurt Fuller as Zachariah and Rob Benedict as Chuck.

As reminded in this week's Mega Buzz, "Lucifer Rising" was written and directed by series creator Eric Kripke.

In this preview clip, a tormented Sam confabs with Ruby about what he "must do" (FYI, the audio is a bit soft, so pump up the volume):