|Dates||???? - 2016 (killed by Mary Winchester)|
|Occupation||Woman of Letters|
|Episode(s)|| 12.01 Keep Calm and Carry On|
12.02 Mamma Mia
Ma'am. If you want him dead, then I'll slit his throat right now. But if you want to take this to the next level, you need to make the call. Bring in Mr. Ketch.
– Ms. Watt, 12.01 Keep Calm and Carry On
Ms. Watt was a member of the London chapter of the British Men of Letters who accompanied Lady Antonia Bevell to America to deal with the Winchesters. Her specialties appeared to be in torture and hand-to-hand combat.
- "You know, I would've thought for two strapping lads like yourselves, you would've lasted a tad longer. But hey, you know what they say. Good things come to those –"
Ms. Watt stands by Lady Antonia Bevell as she interrogates Sam before being ordered to torture him when he refuses to tell them what they want to know. Despite extensive torture by Ms. Watt, Sam refuses to break; this surprises her as she didn't believe it was possible for anyone to withstand that much torture. Though Ms. Watt suggests calling in Mr. Ketch, Toni refuses and instead decides to mentally torture Sam in an attempt to break him in that manner.
After Dean calls Toni and threatens her, Ms. Watt is sent to kill him. Tracking Dean's cellphone, Ms. Watt rams the Impala with an SUV and calmly waits outside as Dean and Castiel recover from the attack. Donning a set of Enochian brass knuckles, Ms. Watt fights Dean and Castiel, who are no match for her. As Ms. Watt prepares to kill Dean with his own gun, Mary Winchester stabs her through the back with Castiel's angel blade, killing her.
Following Ms. Watt's death, Dean and Castiel push her SUV off the road and determine that the last call her phone received was from Aldrich, Missouri, giving them a lead on Sam's location.
Ms. Watt's corpse is found in her vehicle by Mick Davies, who informs Lady Toni of what has happened and that he has arrived to collect her due to her mission going off the rails.