Having absorbed all the souls of Purgatory (a hellish dimension of monster souls), Castiel goes from a trench-coated ally to a terrifying, god-complex deity. His reveal in "The Man Who Knew Too Much" (Episode 22) is Shakespearean tragedy. Cass didn’t betray the Winchesters out of malice; he did it out of love—and arrogance. He believed he was the only one strong enough to stop the archangel Raphael from restarting the Apocalypse.
However, the season’s villain problem is its biggest weakness. Eve is dispatched unceremoniously by mid-season (Episode 19, "Mommy Dearest"), killed by a phoenix ash weapon. Her death feels rushed, leaving a vacuum that is quickly filled by the season’s true, complex antagonist. Behind the chaos of Eve, the Campbells (Sam and Dean’s resurrected grandpa and cousins), and the soulless Sam plot, lurks the true genius of Season 6: Castiel . supernatural episodes season 6
Yes, our beloved angel of Thursday is the big bad. Having absorbed all the souls of Purgatory (a
Eve’s introduction is a masterstroke of lore expansion. She creates new monsters (the terrifying Jefferson Starships—yes, named by Dean), resurrects the Phoenix, and represents a threat that cannot be reasoned with or prayed away. She is nature red in tooth and claw. He believed he was the only one strong
The line that defines the season comes from Castiel: "I'm not going to kill Dean. I'm going to kill you. You're the one who made him weak. You're the one who made him a soldier, who gave him orders, who turned him into a killer. I'm going to tear you apart, Michael, and I'm going to shove you back in your cage."
Every Supernatural fan remembers the whiplash. After the explosive, tear-jerking finale of Season 5—where Sam Winchester literally jumped into the fiery cage of Hell with Lucifer to save the world—the show had reached its natural conclusion. Creator Eric Kripke had told his five-year story arc. The Apocalypse was averted. Roll credits.
