Changes

The season 12 premiere [[12.01 Keep Calm and Carry On]] begins where Season 11 ended, with Dean staring in disbelief at what appears to be his mother, [[Mary Winchester]]. Once he establishes she is really his mother, they sit on a park bench and talk until morning. Dean then takes her back to the [[Bunker]] where they discover blood on the floor and no sign of [[Sam]] or [[CasCastiel]]. Cas returns to the Bunker where Dean introduces him to Mary, and they begin the search for Sam. Cas tells Dean about the woman waiting for them in the bunker so Dean hacks traffic cams and finds the SUV that kidnapped Sam. They track it to the SUV's driver, and then to a vet who treated Sam for a gunshot wound, who gives them the phone number of the woman who kidnapped him - [[Lady Antonia Bevell]]. Dean calls her to let her know they are coming to rescue Sam. Toni sends [[Ms. Watt]] to meet them, who -- she crashes into the [[Impala]] and fights with Dean and Cas, almost beating them. Mary kills her with Cas' angel blade, then becomes upset over taking a life and her sons becoming hunters. Dean comforts her , saying he believes what he and Sam do has made the world a better place to live.

Dean is working with [[Castiel]] to search for [[Sam]] in [[12.02 Mamma Mia]], and struggles with the return of his mother [[Mary]]. She overhears his conversation with Cas, and Dean tells her he's glad she's back but feels she needs time to adjust. Mary worries that Sam won't be able to forgive her for her deal with [[Azazel]]. Cas calls with a possible location for Sam and texts Dean the address. Mary insists on coming along and Dean argues against it, but loses and Mary joins him. In the car, Mary tells Dean about her time as a hunter, how she was good at it but also realized that all hunters end up dead. Dean tells her about how she died, how it caused John to become obsessed with hunting and raise him and Sam in the life, and how Sam wanted out... , but when John went missing, they realized they only had each other. They arrive at the house and join Cas, and while searching the grounds Dean comes across a sigil and disappears. He reappears inside the house where Toni catches him and shoves him into the basement with Sam and threatens to torture him so that Sam will give up the information on the American hunters. Mary appears and threatens Toni with a gun, tosses tossing handcuff keys to Dean who releases himself and Sam. Mary and Toni fight but are interrupted by [[Mick Davies]] , who apologizes for her behavior and states that the British Men of Letters want to work with them instead.