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The penultimate episodes of SUPERNATURAL are all about the set-up for the big finale. Last season Dean went on a rampage in the penultimate episode, massacring the Styne family in retaliation for the death of Charlie. And this eventually led him to a showdown with his brother, who was also working to save him. That storyline ended with the release of the Darkness and now it’s a confrontation with Amara that we seem to be working up to in this season’s finale.

But before that can happen, the Winchesters will need to figure out how to take her down. They seem to have God and Lucifer in their corner now, but will that be enough to lock the Darkness away or to kill her? The synopsis for the episode simply warns that Sam and Dean “will face their biggest challenge yet”, but that’s not very informative, is it? The episode is titled “We Happy Few”, which is likely a shout out to the “St Crispin’s Day Speech” from William Shakespeare’s play, Henry V. In the play (based on the real Battle of Agincourt), King Henry rallies his troops so that they can triumph over their enemies. Towards the end of the speech, Henry utters the lines “We few, we happy few, we band of brothers; For he to-day that sheds his blood with me shall be my brother.”

Now, thanks to a preview for this upcoming episode, we know exactly what “band of brothers” will need to gather together on the battlefield: angels, demons, God and the Winchesters. It’s likely that the angels and demons won’t be very happy about working together, but perhaps maintaining the status quo of the universe will be enough motivation for a temporary alliance.

Elsewhere in the episode, “Rowena makes her move”. But who is she allying herself with this time?

Browse through photos above and don’t miss the penultimate episode of SUPERNATURAL on May 18 at 9:00 p.m. ET/PT on The CW.