: 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.
: Castiel rebels, helping Dean escape to reach Sam. However, they are too late. Sam kills Lilith, only for Ruby to reveal that Lilith was the final seal . Her death is the key that opens Lucifer’s cage. [S4E22] Lucifer Rising
" Lucifer Rising " is the Season 4 finale of Supernatural , directed by Charles Beeson and written by Sera Gamble . It is a pivotal "Wham Episode" that shifts the series from hunting monsters to preventing—and ultimately starting—the Apocalypse. 🎬 Plot Summary : Dean is held in "angel lockdown" by
: 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. Sam kills Lilith, only for Ruby to reveal