Ms. Watt was a villainess from twelfth season premiere of the television series Supernatural, "Keep Calm and Carry On." She was a member of the British Men of Letters, and served as the henchwoman of Lady Toni Bevell.
She was played by Bronagh Waugh.
The episode featured Sam Winchester on the receiving end of tortuous interrogation orchestrated by Toni, while Ms. Watt served as an observer. Ms. Watt is later left to continue the torture, but despite this, Sam refused to break, surprising and impressing the sadistic villainess.
In the episode's climax, the evil Ms. Watt went after Dean Winchester, under Toni's orders after Dean threatened her, and she engaged in combat against Dean and Castiel. Ms. Watt used brass knuckles with angel warding to beat up Castiel, and later stole Dean's gun with intent on using it to kill him. Just as she was about to do so, Ms. Watt was stabbed to death by Mary Winchester, who used Castiel's angel blade to kill her.