|Dates||May 18, 2017 (born)|
|Location||North Cove, Washington|
|Episode(s)||12.23 All Along the Watchtower|
Jack is the Nephilim son of Kelly Kline and Lucifer. He was conceived when Lucifer inhabited the body of President Jefferson Rooney, with who Kelly was having a relationship. Angel lore says that the Nephilim will be an force of great evil, however after the nephilim while in uterero gives Castiel a glimpse of the future, Cas believes will bring peace and paradise to Earth.
While Sam, Dean and Castiel deal with Lucifer, Kelly Kline finally gives birth to Jack in an explosion of light that renders Mary unconscious. When Sam notices the light coming from the home, he goes to check on Kelly, only to find her lying dead in her bed. When he hears a noise, he goes to investigate where he notices foot prints leading to Jack's nursery, where he finds an already adult looking Jack huddled in the corner, smiling as his eyes glow gold.