It’s revealed that Matthews has known Dexter’s secret all along
Lumen somehow plays a role
Doakes is still alive (I don’t care how ridiculously unrealistic the explanation is)
Hannah and Jamie are both seen naked
Hannah is pregnant with Dexter’s child
Dexter must flee and moves to New Mexico where he decides to live a normal life. He goes next door to introduce himself to the neighbors and just as Dex reaches up to knock on the door it flies open and a man yells, “I AM THE ONE WHO KNOCKS!” The show ends with Dexter standing face to face with Walter White.