Arthur Ketch

Mr. Ketch is the unseen main antagonist in season 12 of the horror TV series Supernatural. He is a high-ranking member of the British Men of Letters and a skilled assassin.

He is played by David Haydn-Jones.

Biography
Nort much is known about Mr. Ketch, other than that he is a high ranking Men of Letters member, He is shown to be ruthless and has no tolerance for supernatural creatures or people with supernatural abilities whatsoever. Lady Toni Bevell described him as a psychopath.

Season 12
Mr. Ketch is first mentioned while Lady Toni Bevell is torturing Sam for information. When all their methods prove fruitless, Ms. Watt suggests bringing in Mr. Ketch; however, Toni is vehemently against it.

Later on, Mick Davies retrieves Toni and informs her that he has sent for Mr. Ketch, who is shown preparing to leave the UK. This leaves Toni visibly uncomfortable.

In American Nightmare, Mr. Ketch drives up to the Impala on a motorcycle and stares it at for a moment before driving away. He later tracks down and kills Magda Peterson, telling someone on the phone that he cleaned up the Winchesters mess and they were right about the Winchesters being unable to kill Magda.