Regarding Dean

Regarding Dean is the 11th episode of Season 12. It aired on February 9, 2017.

Summary
DEAN LOSES HIS MEMORY - Sam enlists Rowena's help to track down an old world, powerful family of witches after Dean gets hit by a spell that is rapidly erasing his memory.

Plot
TBA.

Main Cast

 * Jared Padalecki as Sam Winchester
 * Jensen Ackles as Dean Winchester

Guest Stars

 * Ruth Connell as Rowena

Co-Stars

 * Vincent Gale as Boyd Loughlin
 * Tirra Dent as Catriona Loughlin
 * Justin Turnbull as Gideon Loughlin

Featured Supernatural Beings

 * Witches
 * Sirens (mentioned)

Continuity

 * The Grenade Launcher appears again, but Sam notably marks it with a "NO!" for Dean when he opens the trunk.
 * Rowena's full name is confirmed to be Rowena MacLeod when she introduces herself as such to Catriona Loughlin.

Trivia

 * The episode was watched by 1.71 million viewers and got a 0.6 rating.
 * Rowena is revealed to have encountered the British Men of Letters many years ago. They had forced her to flee from her homeland sometime after her expulsion from the Grand Coven.
 * Vincent Gale, who played Boyd Loughlin, previously played Evan Hudson in Crossroad Blues and Viggo in Torn and Frayed.
 * In an ironic twist, Rowena's life is saved by Dean using the witch-killing bullets. These bullets had been created by Sam in Brother's Keeper specifically to deal with Rowena.
 * According to Rowena, Dean's kill count numbers in the scores.

Goofs

 * In the "Then" flashback sequence at the beginning of the episode, Sam bursts in on the Book Club and tells them that "these are witch-killing bullets." However, in the episode and the visual part of the flashback, he's armed with the Colt, not witch-killing bullets. The line is from The Bad Seed when Sam threatens Rowena to break the Attack Dog Spell on Castiel.
 * When Catriona throws the glass shard at Rowena's head, Rowena doesn't move her head until a full second after the shard misses it.