Sam and Dean follow up a new case inChester, Pennsylvania, where people are dying infreak accidents.Ellen Harvelle, inexplicably alive and married to Bobby, discovers the victims' ancestors all immigrated to the United States in 1912 on theTitanic, a ship none of them have ever heard of that narrowly missed an iceberg on its maiden voyage. It is ultimately revealed that Castiel had given Balthazar the order to go back in time and save theTitanicfrom ever having sunk, creating achain reactionin which more souls are produced to fuel Castiel's side's power in the Heavenly civil war. One of the side-effects of the chain reaction is that Ellen and her daughter Jo never died. It transpires thatAtroposofthe three sisters of Fateis responsible for the freak accidents, as she is trying to kill all the descendants of theTitanicsurvivors who now exist but shouldn't. To protect Sam Dean bella and his daughter from the wrath of Atropos, Castiel is forced to undo the timeline
Sam and Dean wake up in the Impala back at Bobby's place, bella is there she went to hung her brothers and grace ran to her uncles and they hugs her with Celine Dion's "My Heart Will Go On" playing on the radio. bella said she loves this song celine dion is one of her fav singers and titanic is one of her fav movies as They both think they have had the same dream, but Cass appears next to bella and pick up his 1 year old daughter and reveals that what happened was real. He wants them to remember so they know who Fate is, and so that they know Castiel is fighting for freedom from destiny bella kiss cass . Then, when Dean asks, he tells him that Balthazar really did change history because he didn't like the movie "Titanic," revealing nothing about his possible war plans.
Inside, Bobby lies asleep on the couch. Sam and Dean look at him sadly, knowing what he's lost. Dean covers him with a blanket and they let him sleep.