Season 5 is by far the best season of the tv series. The whole season is so cool because of the element of Lucifer. Now I’m not sure I agree with the casting of Mark Pellegrino as Lucifer or rather the human form that Satan takes over, or even some of his portrayal as the fallen angel but the season overall makes up for it. The revelation comes that Sam is supposed to be the true vessel for Lucifer and that only the archangel Michael’s sword can defeat him – and the sword is actually Dean, Michael’s true vessel! Bobby is left without the use of his legs after being possessed by a demon and Castiel can’t save him as he is cut off from heaven and left without most of his powers. He tells Dean that he wants to find God, the only one who can defeat Lucifer and leaves. Later Dean & Cas lure out the archangel Raphael in his human vessel, hoping he can help them find god but Raphael even says that god might be dead.
Meanwhile Zachariah does everything he can to convince Dean to agree to become Michael’s vessel, even transporting him into the future to show him the consequences of saying ‘no’; a bleak future with people ravaged by a disease and Lucifer in Sam’s body. But Michael stays firm and rejoins Sam and begins hunting again. Dean tells Sam that starting the Apocalypse isn’t his fault alone as he himself had broken the first seal and that they shouldn’t think about the whole vessel thing too much but instead fight together.
While investigating a homicide apparently executed by the Incredible Hulk, Sam and Dean are trapped inside TV land. They suspect the Trickster is the reason for it, and attempt to track him down. Sam suggests they ask the Trickster for help fighting the Apocalypse, and Dean reluctantly agrees. They encounter him several times, but are unable to trap him until Dean remembers a warning from Castiel about the Trickster, which leads the brothers to believe the Trickster is in fact a far more powerful creature than a simple demigod. They manage to lure him and trap him in a burning circle of holy oil. Since the Trickster is unable to escape, it confirms their suspicions that he is actually an angel. He applauds them and admits he’s actually the Archangel Gabriel, who voluntarily fell from Grace several years before as he grew tired of watching his brothers fight each other. He trapped Sam and Dean because he wants them to agree to be Lucifer’s and Michael’s vessels, respectively, in order to end the Apocalypse. Gabriel also states that the lives of Sam and Dean mirror the lives of Lucifer and Michael, since Sam rebelled against his father while Dean remained obedient. Dean still refuses to say yes to becoming a vessel, but before they leave, he frees Gabriel from his trap and accuses him of simply being too afraid to stand up against his own family.
The brothers get the Colt back from Crowley, a demon, who states that he wants Lucifer dead because he believes that eventually Lucifer will kill all demons after he destroys humanity. Jo & Ellen are killed while fighting off hellhounds and blows them up along with them. The Winchesters must also deal with the angel Anna, who travels back in time to stop Mary and John Winchester from conceiving Sam. Just as Anna is about to kill Mary, the Archangel Michael, having possessed John’s body, enters the room and burns Anna to death. Dean & Sam are killed by angry hunters and go to heaven where they find the happiest moments of their lives. On their way they meet Ash, living in an illusional Roadhouse. He says that the people sent to Heaven are rewarded for their good deeds with a replica of their happiest memory. They also encounter Pamela, who states that being dead and in Heaven is not so bad, after all. The angel Joshua tells Dean that God will not help them. It is revealed that He is the one who put them on that airplane in the begining of the season, brought back Castiel and now granted them salvation in Heaven. Joshua then returns them to Earth with their memories, where the brothers meet Castiel and tell him everything.
Dean leaves for a while to go and see Lisa and her son Ben, not knowing if he will ever see her again and tells her that he loves her. Meanwhile Zachariah uses Adam, their half-brother, as bait to get Dean to agree to be Michael’s vessel but when Michael descends, the three brothers flee but Adam is trapped inside and disappears. While on the road they then find a hotel in which a group of pagan gods, including Kali, Ganesh, Mercury, Zao Shen, Baron Samedi, Odin, and Baldur, who want to use them as bargaining chips to stop the Apocalypse. Dean and Sam are soon joined by Gabriel under his Loki persona, who is willing to help them out. Lucifer is summoned by Mercury. He arrives and kills Mercury, and all of the other gods save for Kali. Gabriel shows up to help the brothers and sends them away. As he faces Lucifer for the first time in centuries, Gabriel tells him he’s not loyal to him or Michael, but to humans, because despite their flaws, they’re always willing to try harder and forgive. As Gabriel makes his move, Lucifer is onto him and kills him. Outside, Dean and Sam watch a movie Gabriel gave to them, in which the archangel explains to them that they can’t kill Lucifer, but they can trap him back in Hell. All they need are the four rings that belong to the Horsemen to do this.Dean goes with Crowley to find Death and get the last ring. They locate Death in Chicago, which according to Bobby is about to be wiped out by the storm of the millennium. Death explains that he is tied to Lucifer through a spell. This is the only reason he didn’t try to find Dean, but has instead had to wait for him. He offers to give him his ring, but there is one condition; agree to Sam saying yes to Lucifer so they can lure him into the trap. Dean agrees, receiving the ring and instructions on how to use all four of them to trap Lucifer.
In the season finale, Chuck narrates the story of the life of the Impala and how the boys spent their time in it. Sam and Dean confront Lucifer, who knows of their plan to use the Horsemen’s rings to trap him back in his cage. Despite this, Sam offers himself as a vessel, hoping that he can overcome Lucifer’s control and throw himself into the prison. Lucifer is too strong, and Sam disappears in his body. Dean learns from Chuck the time and location of the final battle between Michael and Lucifer. The following day at the battleground—Stull Cemetery in Stull, KS (just outside of Lawrence, Kansas) — Lucifer tries to talk Michael out of fighting, but he refuses. However, Castiel interrupts the fight by banishing Michael with holy fire. An angry Lucifer kills Castiel, and then snaps Bobby’s neck when he shoots him. He then starts brutally beating Dean, but stops when he notices an old army man of Sam’s inside the Impala revealed earlier during Chuck’s narration. Sam remembers his life growing up with Dean, and manages to take control of his body. He uses the rings to reopen the door to the cage, and prepares to jump inside. Michael returns and tries to stop him, but he too is pulled into the pit while grappling with Sam. Castiel, resurrected again as an angel, heals Dean and brings Bobby back to life. He returns to Heaven, hoping to bring order now that Michael is gone. As Dean attempts to move on, he seems to turn his back on hunting and returns to Lisa. Chuck smiles after finishing his narration of the story, and vanishes into thin air. Later that night, a streetlight flickers out and Sam is revealed outside Lisa’s home, looking in the window at the “family” eating dinner together.