Jack dies of his condition, leaving the Winchesters and Castiel in mourning. In an attempt to save Jack, Sam contacts angel expert Lily Sunder, now an old woman, who suggests that they can resurrect Jack and cure him with her magic which will use the power of Jack's own soul to sustain him.
Initially resurrected soulless, Jack's soul is restored by the Garden of Eden after he visits through the Occultum.
Following his death, Jack is reunited with his mother in Heaven but is stalked by a dark force. Lily Sunder uses Enochian magic at the cost of her life to resurrect him. Castiel is able to return Jack's soul to his body from heaven. Lily's magic is powered by Jack's soul, but keeps his body intact.
Supernatural 15x13 - Jack gets his soul back and says sorry to Sam and Dean for killing Mary!
In Ouroboros, Jack absorbed the Alternate Michael's grace returning him to full power, although he had to burn off his entire soul in order to kill him. When his powers were restored, Jack displayed his full angelic wings to show he was himself once more.
He wishes it didn't happen. Dean is barely holding it together. He doesn't like that Jack is calling Mary's death, “the accident.” But he plays along and says they understand and they forgive Jack.
After going to Heaven, Dean is impressed and proud of the changes that Jack has made. Bobby Singer calls Jack Dean's kid while they talk and Dean doesn't say anything to the contrary, suggesting that Dean ultimately forgave Jack and came to see the young Nephilim as his family again.
In The End, Jack Became A “Hands-Off” Deity
He was more powerful than God and Amara together. He put the whole world to rights but didn't bring back all the people that had died because of his plan.
Dean appears visibly saddened by Castiel's lack of faith in him. Castiel later returns in Two Minutes to Midnight and apologizes to Dean for not having more faith in him. Dean forgives Cass, and they reconcile.
Jack begins hallucinating Lucifer talking to him. At the same time, the Winchesters discover Nick's body and learn from Rowena that Mary is dead, accidentally killed by Jack's outburst.
Cassandra Masters is the daughter of Castiel and Meg Masters and the only known Nephalem to exist, which is a hybrid between a union of an angel and demon, even being part human due of Castiel and Meg's human vessels. Cassandra acts as one of the leading main characters with Sam and Dean.
After a soulless Jack kills Nick for trying to resurrect Lucifer, he accidentally kills Mary in a brief fit of rage. Mary is reunited with her husband in Heaven and is now at peace in a shared Heaven with John.
Jack uses his powers to heal Cas because the antidote obtained via the best plan of all time unfortunately doesn't work. When he tries to also heal Dean, though, Cas won't let him; he's confident Dean will heal (because he's Dean, and Dean is Dean) and Jack is being entirely too cavalier about his soul.
In a final act of defiance, the Winchesters wouldn't submit to God himself. And while he beat them up … Jack won the war. You see, when Jack exploded last week, he apparently became a sort of a black hole absorbing power and energy, and as God used his power on Sam and Dean, Jack sucked it all up and … became God.
Supernatural had a knack for doling out unexpected twists in its storylines, but the most massive mind-bending revelation was in Season 11 when it was revealed that the meek Chuck Shurley was God.
Live Free or Twihard - Dean is bitten and turns into a vampire.
Did Supernatural's Castiel Love Dean Romantically (& Since When) Supernatural season 15 controversially saw Castiel declare his love for Dean Winchester before dying.
In Supernatural's series finale, Dean Winchester died on a hunting job, but his soul eventually ended in Heaven. Some fans were happy to see a proper conclusion for Dean Winchester's story, while others argued that he deserved better.
Michael is the first and oldest of the four Archangels created by God, making him the very first being ever created and the very first of Gods creations, as well as one of the oldest and most powerful beings in the universe, as well as one of the oldest and most powerful beings in all of existence.
The omnipotent beings
The most powerful creatures in the Supernatural universe are the primordial beings known as God (aka Chuck) and his twin sister Amara, who together comprise the balance of all existence through their light and dark dichotomy.
Jack's descent into evil arguably began as soon as his power was restored, as, immediately after Michael's defeat, Sam, Dean, and Castiel looked noticeably frightened at the youngster's ominous power.
Jack tells Sam that he doesn't know if he can open another rift, and that he needs to find his father, who will protect him. When Sam tells him Lucifer doesn't do that, Jack corrects him and tells him that Castiel is his father, because his mother told him that Castiel would keep him safe.
Sam Winchester (Jared Padalecki)
After losing his brother, Sam lived a long, happy life. He got married, he had a son — named Dean — and when he died in his old age, he finally got to hug Dean in heaven.
After Dean died in the series finale, Sam went on to get married and have a child, whom he named after his brother. While it seems Sam didn't continue to hunt, the show also didn't reveal what his profession ended up being.