At the end of Supernatural
season 4, Sam turned his back on his
brother, left him behind and went off to do what he thought needed to be
done in order to stop Lilith. In "99 Problems," it was Dean's turn to
do the same thing.
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In many ways, Supernatural
is like a ping pong match of
sacrifice. John gave up his life to save Dean. Dean gave up his life
to save Sam. Sam gave up his humanity to stop Lilith. Now Dean is
giving up his own body to save the world.
Last week I wrote that Dean throwing away his necklace was a sign that he had already, subconsciously, made the choice to say "Yes" to Michael. That was reinforced when Dean was able to kill the Whore of Babylon. Dean was a true servant of God because, in his heart and in his soul, he'd already made the sacrifice to Michael.
For anyone who thinks the final scene of Dean with Lisa Braeden was out of character, look at his track record. When Dean makes a sacrifice, it's for the good of those he loves. It was obvious from the first time she appeared in season 3 that Lisa was the love of Dean's life. She represented the life he could have if it weren't for fighting demons and saving the world.See the 14 Greatest Loves of Dean's Life>>
In season 3's "Dream a Little Dream of Me," we saw that Lisa is always in the back of Dean's mind, a fantasy of his perfect life. Up to this point, her safety has never really been an issue, which is why he's never gone back to her, but with the Apocalypse coming and his recent trip to Heaven, Dean knew that he had to put things in order with her.
It's a more mature Dean than we're used to seeing, but it's still him. He's not blindly sacrificing himself with no concern for others. This time, Dean is making a well thought-out sacrifice, proving that Dean was learned some valuable lessons about standing up and doing the right thing.(Image courtesy of the CW)