 Castiel, Sam and Dean infiltrate Sucrocorp thanks to a distraction from Meg and he and Dean confront Dick Roman in the labs.Dick throws Castiel across the room when he tries to attack, but after Dean fails to kill Dick, Castiel holds his head in place from behind allowing Dean to stab Dick through the neck with the weapon, killing him.As a result of this, Castiel and Dean are sucked into Purgatory with Dick's soul and after letting Dean know this and that they are more likely to die than get out, Castiel disappears, leaving Dean alone.