Supernatural Season 9 Episode 22- Stairway to Heaven

 

After a massive attack on the angels, Castiel calls Sam and Dean for help. As they leave, Dean's eagerness to bring the First Blade doesn't go unnoticed by Sam who is worried about the cost to his brother whenever he uses the Blade. Meanwhile, Castiel is shocked when he learns the angel that caused the attack was one of his followers and did it in his name. Dean discovers there is a conspiracy amongst Castiel's angel followers and at the heart of it is Tessa, the Reaper. Guy Bee directed the episode written by Andrew Dabb. 

 Season 9 will end  with Dean feeling the effects of the First Blade. Meanwhile, Metatron makes his move against humanity, as Sam, Dean and Castiel try to stop him.( Supernatural Season 9 Episode 23- Finale)