Dunno about everyone else but it's bugging me as to what this seasons' 'BIG BAD' is going to be......
It's presence alone is obviously to blame for the faults at hand. (warewolves attacking on a half moon, creatures never seen before). What kind of thing could cause this? other than Sam and his grandfather's revival, Although i can't see this being a 'hijacker' storyline..... The only thing powerful enough to pull this kind of thing off just got sent back to his cage, So perhaps the problems not from down below, But from up above.

Anyone else got a theory?

I've wondered about that myself and I agree with you on the big bad but do oyu think its coming from up above? If so I wonder what the motivation is, because they were also part of it in season 5.

Unless were already looking at the problem with is Sam himself since he came back so suddenly and so different than he was before, and not only but brought along people who were supposedly in heaven (which makes you wonder since Dean and Sam technically were in hell when they died because of their nature, but wasnt samuel the same? so why was he sent to heaven?)

the way Samuel threw at Dean "yeah cousins and the rest" was a bit awakrd so who knows, right? Plus they've also been fighting alone for a year, makes you wonder...

Good question.

I think the reoccuring 'big bad' could be the Campbells - Grandpa and cousins.

What I hope we'll see is Rob and Walt, werewolves, chupacabras, vampires, creatures never seen before and etc.

Would really love to see a vampire infomercial - take these red pills and never grow old, never die.

Haha! I read that and my mind instantly jumped to that line from Time is On My Side. Doc Benton's "Forever young, never die." :lol2