Keep Calm and Carry On

Keep Calm and Carry On is the season premiere of Season 12. It aired on October 13th, 2016.

Summary
MAMA WINCHESTER IS BACK — Dean (Jensen Ackles) is overwhelmed as he comes face to face with his mom, Mary Winchester (guest star Samantha Smith). Meanwhile, Sam (Jared Padalecki) is fighting for his life after Toni, from the Woman of Letters, shot him.

Main Cast

 * Jared Padalecki as Sam Winchester
 * Jensen Ackles as Dean Winchester
 * Mark Sheppard as Crowley
 * Misha Collins as Castiel

Recurring Cast

 * Elizabeth Blackmore as Lady Toni Bevell
 * Samantha Smith as Mary Winchester

Guest Cast

 * Bronagh Waugh as Ms. Watt
 * Colin Lawrence as Dr. Gregory Marion

Featured Supernatural Beings

 * British Men of Letters
 * Angel
 * Demon
 * Vampire
 * Archangel (not seen on-screen)
 * The Darkness (mentioned only)

Music

 * Bad Boys by April Wine
 * Diesel Smoke, Dangerous Curves by Tom Powder
 * Solitude by Black Sabbath

Quotes

 * Castiel: This must be difficult for you. I remember my first moments on Earth. It's jarring.
 * Mary: One word for it. I grew up with hunters, I've heard about people coming back to life before. But to actually do it, after thirty years... A lot's changed. A lot.


 * Sam: I've been tortured by the Devil himself. You... You're just an accent in a pantsuit. What can you do to me?


 * Mary: I spent my life running from this, from hunting. And I got out. I never wanted this for you and Sam.

Trivia

 * "Keep Calm and Carry On" was a slogan on poster produced by the British government for the lead-up to the World War II. The term itself coined by UK's temporary Ministry of Information on 1939 regarding the public safety. After its reemergence in 2000, the phrase later became well-known again, leading the phrase entering the meme world during 2007 and widely spread to internet during 2009 - 2010.
 * This episode itself also very similar to the 2008 English-language French action thriller film "Taken" in many aspects.
 * This is the fifth episode where Sam and Dean deal with a strictly human antagonist. Other episodes include: The Benders, Family Remains, Thinman and Just My Imagination.
 * And, it's likely from this episode, the antagonists will be human, since they dealing with British Men of Letters' members.
 * For the first time Misha's billing in the opening credits reads "and Misha Collins." This type of credit, sometimes called "last billing," is typically contractually negotiated by well-known actors in supporting roles.
 * This is the first episode that we see that angels appear as comets crashing to Earth when they are banished.
 * The billboard Castiel crashes through is an ad for a Mystery Spot, like the one featured in Mystery Spot.
 * Sam is shown the visions of the deaths of Charlie Bradbury, Kevin Tran, Sarah Blake, Dean, Meg Masters, Mary Winchester and Jessica during his drug-induced mental torture applied by Lady Antonia Bevell.
 * The two demons employed by Lucifer to clean up his mess are Jervis and an unnamed demon. The former previously appeared in "Our Little World" while the latter previously appeared in "We Happy Few". In this episode, they are both killed.