 However, Castiel later returns – still in Jimmy Novak's body – in the fifth-season premiere, "Sympathy for the Devil", killing two fellow angels in order to save Sam and Dean.He is uncertain as to how he was resurrected, but alludes to Zachariah it may have been God's doing.After ordering Zachariah away, Castiel carves Enochian sigils into Sam and Dean's ribs to hide them from all angels, including Lucifer.