REVIEW (spoilers from previous seasons):
Season 6 continues one year after the fight with Lucifer. We see Dean having his life with Lisa and by the end of the 1st episode everything is going wrong. First half of the season follows the boys (and some previously dead people) hunting monsters so they will find how it's possible to work on groups. There are some demons, angels, purgatory, vampires (lol at the episode making fun at Twilight), shapeshifters,Death, dragons (!!) and many other creatures who get at the game and of course Sam. Who something is going really wrong with him. Second half of the season follows with Sam's condition fixed but still not perfect and now looks likes someone from the good side had turned bad and messes secretly with the brothers.
I wasn't expecting to like the season. I believed that last year, they could have give us a very good series ending with the last episode. One writer also left the production. Surprisingly, it was GOOD! It found its awesomeness again! We got the funny Dean and the cute Sam. Probably it's one of the seasons i enjoyed the most. The writers didn't afraid to kill many characters, bring back to life new ones, mess with the angels story a little more, create some cool episodes just for fun, use some time travel and make it really bloody. It was the most bloody and creepy season of them all. It felt good and real though.
There was also an episode, produced by Jensen Anckles (Dean), where the boys weren't featured at all and it one of Bobby's adventures.
Now, they finished the episode with an OMG cliffhanger and i seriously can't wait for next year! Season 7 FTW!! Bring it people!