: Dean is held in "angel lockdown" by Zachariah, who reveals that the angels want the Apocalypse to happen so Michael can defeat Lucifer in a final battle.
: Sam and Ruby track down Lilith to prevent her from breaking the 66th seal. Sam believes his demon-blood-enhanced powers are the only way to kill her and stop the Apocalypse. [S4E22] Lucifer Rising
: After Dean finally breaks into the chapel and kills Ruby with Sam's help, a blinding beam of white light erupts from the floor. The brothers clutch each other as Lucifer begins to emerge. 🗝️ Key Revelations & Themes Review: Supernatural Season 4, Episode 22: Lucifer Rising : Dean is held in "angel lockdown" by