Supernatural 15x13 - Jack gets his soul back and says sorry to Sam and Dean for killing Mary! - YouTube.
Initially resurrected soulless, Jack's soul is restored by the Garden of Eden after he visits through the Occultum. Jack later reveals that he is being turned into a bomb that will cause God and the Darkness to cease to exist, but which will also be fatal to Jack himself.
Now in Season 15, Jack's been brought back to full health and had his soul restored because he's the only one who can kill God, and all he feels is trepidation and self-doubt.
Jack, an emotional wreck, immediately apologized to Sam and Dean for killing Mary. But this time, he really meant it. He felt remorse. It's only then that Cas confirmed what everyone suspected: Jack got his soul back.
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.
So what powers did Jack-Jack have? The Verge put together a complete list of his abilities seen in the film. Even though Jack-Jack's dad, Bob Parr (Craig T. Nelson), says in the film that his son has 17 powers, The Verge only noticed 14, including “Laser eyes,” “floating” and “teleportation,” among others.
In The End, Jack Became A “Hands-Off” Deity
Jack sucked up all their power and he was the one to kill Chuck, and take all his power too. 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.
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.
Season 15. After escaping from Hell, Belphegor possesses Jack Kline's corpse. At first, the Winchesters think that Jack has come back to life, but Castiel is able to tell that it's actually a demon using Jack as a vessel.
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.
However, killing Michael burns away a great deal of Jack's soul, leaving him soulless. Though he was resurrected a second time with no soul, Jack's soul was subsequently restored by the Garden of Eden after he journeyed to it through the Occultum.
Billie resurrected Jack and sent him to Earth to feed on Grigori hearts in an effort to make him stronger so that eventually he'll be able to fight Chuck. He would have checked in with Cas and the Winchesters sooner, but he needed to lay low so that Chuck, who fears him, wouldn't find him and kill him again.
Jack says he snapped and it was over quickly. 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.
Castiel is a young Seraphim, former leader of his garrison, and youngest angel in all of Heaven. He is the husband of the demoness, Meg Master and widowed father of his daughter, Cassandra Masters.
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.
Throughout the course of Supernatural Season 14, we watched Jack transform from a powerless human to a soulless nephilim. It was the biggest transformation we'd seen. He went from human to devil in a matter of 17 episodes or so, and it's left us with many questions.
Character Information
Jack Kline (b. May 18, 2017) is the son of Lucifer and Kelly Kline. He is the first and only known Nephilim to be sired by an Archangel. Jack was taken in by Sam and Dean Winchester who would teach him how to master his powers.
In season 12 of Supernatural, a brand-new character was introduced who became one of the most powerful beings in existence. This was Jack, a Nephilim -- a baby born from the union of a human and an angel.
As a Nephilim son of the second archangel, Jack is an immensely powerful being. At full strength, he is stronger than any Angel of Creation.
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.
Using the demon cure process to try to turn his brother back, Sam lets his guard down and Dean escapes. With the help of Castiel, however, Dean is cured, but still remains an enhanced human with the Mark of Cain.
Using the power of his soul, Jack was able to heal Castiel of the gorgon poison when the antidote failed to work. Jack later heals Stacy after accidentally stabbing her with an angel blade and heals Sam's serious head injury from Nick.
Trimurti is considered to be the most powerful god as he is a combination of Brahma [The Creator], Vishnu [The Preserver] & Shiva [The Destroyer].
Jack Kline
In Jack's case, that meant he could grow up to become even more powerful than Lucifer, Supernatural's most feared angel. Jack helped the Winchester brothers in the final battle against God. He ascended as the new God, resurrected humanity, and disappeared from mortal affairs.
While the two fought, Jack's underlings kept Inuarashi exhausted while he tried to fight the All-Star, until the Gifters began turning on the other members of the crew thanks to Tama, confusing Jack. Jack is defeated by Inuarashi.