[s12e21] There's Something About Mary «TRUSTED»

The British Men of Letters use a "bug" (a tracking/listening device) to locate and eliminate American hunters. Sam and Dean eventually find the bug in the Impala.

The episode is often discussed by fans for its dark tone and the controversial writing style of Buckner and Ross-Leming, who frequently handle episodes involving significant character deaths or major plot shifts. You can find community discussions and breakdowns on the Supernatural Reddit or browse fan-cataloged details on Archive of Our Own. [S12E21] There's Something About Mary

Lady Toni Bevell returns to the U.S. to oversee Mary's conditioning, leading to a tense face-off between her and Mary. Production Credits Director: P.J. Pesce Writers: Brad Buckner & Eugenie Ross-Leming The British Men of Letters use a "bug"

Sam and Dean Winchester discover that hunters they know are being killed in "accidents" across the country. This leads them to realize the British Men of Letters have turned hostile against the American hunting community. Meanwhile, Mary Winchester is being held and brainwashed by Lady Toni Bevell and Arthur Ketch at the BMOL base, using a psychological conditioning process to turn her into a cold-blooded assassin. You can find community discussions and breakdowns on

Mary undergoes intense mental torture. By the end of the episode, her brainwashing is seemingly complete when she is ordered to kill a fellow hunter and friend.