Supernatural Season 6

First this is my favorite season just because my top 6 episodes come from this season.

Theses are in order by ep #

Ep 4 Weekend at Bobby's
Ep6 You Can't Handle the Truth
Ep 9 Clap Your Hands if You Believe
Ep 15 The French Mistake
Ep 17 My Heart Will Go On
Ep 18 Frontierland

Second Season 5 was really about coming up with a plan to stop the Apocalypse. Meaning for them not letting Michael or Lucifer take control of their bodies and hiding from all the other angels while going up against the 4 horsemen( War, Famine, Pestilence, and Death).
In the end, the brothers get the rings of the horsemen that turn out to be the things they need to open Lucifer's Cage, but this means Sam has to say yes in letting Lucifer's enter his body and have a battle for control for Sam's Body just so Sam can jump into the pit.

In season 6 we see Dean living a normal life with a girl from his past,Lisa, and her son, Ben. Then Sam shows up to cure him of Djinn venom and Dean leaves to go back Hunting with Sam after Lisa persuades him to go. It takes about a month to figure out Dam came back with no Soul, but I the meantime they've had to with Castiel being to busy to help them because Heaven is in Civil War and Heavens weapons are on Earth. While Bobby deals with getting his soul back from Crowley the now King of hell. All of this while the brothers hunt anything that is killing humans, one just happens to be a truth God, she makes every one in her presence , that has a soul, speak the truth. This is how Dean finds outs that Sam came back different.

And that just the first quarter of Season 6
Next you got Fairies, dragons, Dean being Death for a day, Mannequins killing people, Sam and Dean going to an alt world( our world, were they are Jared Padalecki and Jensen Ackles playing Sam and Dean), and the Mother of All ( evil).

Season 6 is the best Season when it comes to reinventing this show.