Dean Winchester - Season 7

Season 7

Trapped for options against the insane and god-like Castiel, Dean, Sam and Bobby attempt to summon and bind Death to order him to kill Castiel. Death refuses, but provides them with a means of performing a ritual to extract the Purgatory souls from Castiel. Unfortunately, Castiel's vessel has already been taken over by the Leviathans, God's prototype monsters, who seemingly kill Castiel before escaping.

Facing a new threat immune to their conventional weapons, Dean and Sam are left desperately struggling against the Leviathans, with matters being made worse when Bobby is killed by Dick Roman, the leader of the Leviathans. With Sam's sanity breaking down due to him experiencing halluciations of Lucifer based on his memory of his time in Hell, Dean attempts to continue their usual jobs- even teaming up with Elliot Ness during a time-travelling battle with the pagan god Chronos-, but Sam's sanity eventually reaches such a low point that Dean is forced to commit him to a psychiatric institution. Based on a card that he later learns was provided by Bobby's ghost- who has remained on Earth by 'bonding' to his flask-, Dean manages to find a healer for Sam in the form of Castiel, alive with no memory of his angelic past, but even the restored Castiel can only 'heal' Sam by taking Sam's mental damage onto himself.

Learning of the Leviathans' plans to turn humanity into the perfect food source, Dean and Sam mount a final offensive against Dick Roman after Castiel recovers enough to help them find a tablet containing the Word of God, which the prophet Kevin Tran is able to read, revealing that Leviathans can be killed by the bone of a righteous mortal soaked in the blood of the three fallen (Castiel the fallen angel, the Alpha Vampire, and Crowley the King of Hell). Armed with this weapon, and with Castiel's ability to perceive the true nature of each Leviathan, Dean is able to kill Dick, but he and Castiel are pulled in Purgatory as Dick dies.