The year is 1979, Chuck had time travelled to that year, it was the year Dean was born. Chuck was planning to kill Dean even though he was only a few months old. Chuck had gone into Dean's nursery after Mary and John went to bed. There was Dean, trying to sleep, fussing a little but not too much. Chuck had picked up the little infant and was about to kill him.
John had gone into Dean's room, there he saw Chuck holding his newborn son, John was about to run at Chuck to get Dean back but Chuck sends John flying into a wall, waking Mary up. Mary goes into Dean's nursery, there she sees John unconscious and sees Chuck holding her son who was crying and screaming because he was scared.
Chuck then made Mary pass out with putting his fingers against her head, he then set Dean down, he was about to kill Dean, Cas had sent Dean back in time to stop Chuck. Dean and Cas fought their hardest to keep Chuck from alternating the past.
Chuck then had enough, he then flashes back to the present, Dean walks over to the nursery, there he looked down at his younger self, he then picked up his younger self.
Dean: Hey buddy, listen in 1983 you're gonna be a big brother. Your brother's name is Samuel aka Sammy. On November 2, 1983 a monster named Yellow Eyes aka Azael will give Sam his blood, killing your mom.
Mary and John then wake up, listening to Dean.
Dean: Your mom will be pinned to the ceiling of Sam's nursery. Your dad John, will take you and Sam across the country hunting the supernatural.
John and Mary look at each other while they listen to their son who had time travelled from the future to stop God from killing him as an infant.
John holds Mary's hand, hoping everything was a lie.
Dean: Sam will go to Stanford, resulting with a fight between him and John. In 2005, you will go to Stanford to get Sam, your dad will be missing because he was chasing the yellow eye monster. When you drop Sam off back at Stanford but when you are about to leave, Sam's girlfriend is pinned to the ceiling just like your mom was, then a fire will appear behind her bleeding body.
Cas; Dean, it's time to go.
Dean nods at Cas, knowing it was time to leave. He then looked back at his younger self, he then pets his head, comforting his younger self.
Dean: Stay safe buddy. Also, when you're sixteen you're getting the Impala. You're gonna learn how to fix that car, the engine and rebuilding it.
Cas then flashes with Dean back to the present. Dean didn't know if he had done anything to mess up the past but he didn't, everything had happened that he had told his younger self.
Dean: Cas, why was Chuck going to kill me?
Cas: Chuck to stop the bloodline of Michael and Cain.
Dean: But Sam is the bloodline to Lucifer and Abel, how would that help me?
Cas: Chuck had thought that if he killed you, John and Mary wouldn't try to have Sam and then they wouldn't have children who will stop the end of the world, try to stop monsters.
Dean: Okay,Okay Cas I got it.
Cas then nods and walks away from Dean, Dean then looks at a picture of him and Mary from when he was a kid.
Dean: I'm sorry Mom.

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SPN Theories
FantasySupernatural is a popular tv show about two brothers Dean and Sam Winchester who hunt the supernatural because of their mother Mary WInchester nee Campbell. When Sam was only 6 months old, a monster named Azael aka Yellow Eyes was giving Sam his blo...