13x01 Lost and Found

Lucifer's son Jack seems unsure of himself and the world. Dean tries to shoot him and he knocks out both Winchesters with a sonic scream, leaving to search for his father. He ends up at a local police station and seems mostly innocent but is unsure of, and unable to control, his power. Sam and Dean follow; Dean insists on killing him but Sam sees Jack as just a child. While Dean explains what Jack is to a local officer, Jack explains he learned English from his mother and grew up quickly because she told him the world was dangerous; she also said that Castiel was the father who would protect him. Three angels show up wanting to use Jack's almost limitless power for themselves. The Winchesters banish two of them and kill the third; Jack is stabbed in the heart in the process but is unharmed by the blade. Dean agrees to take him to the bunker, but only until they can find a way to kill him. They are on their own with Chuck not answering prayers. They give Castiel and Kelly a hunter's funeral, also saying goodbye to Crowley and Mary whom they assume Lucifer killed. In the alternate world, Lucifer keeps Mary alive because he needs her for something.