[EVERYTHING] - My theory about the 'Magnificent Seven'.

As we all know, Jon, Thoros, Beric, The Hound, Tormund, Gendry and Jorah travel north of the Wall to catch a wight. Of course we want them to succeed and bring it to Cersei but I think we can all agree that it would feel like a letdown if they just bring one to Cersei only for her to say "Yeah, looks dangerous. Let's do it." So here's my theory:

3 men (or fewer) of the 7 survive but 4 of them return, one as a wight.

Cersei will want to see just how dangerous a wight is. After all, she only knows them from the stories. Now, what better way to do that than to have her own zombie creature fight it?

You guessed it: Cleganebowl.