Who is the most formidable "Monster of the Week" character?
I'd say Pusher, whom Scully describes as a "highly intelligent sociopath with no fear of dying". The likes of Tooms, Leonard Betts, and Bob Roberts ("Hungry") have freakish physical capabilities, but Pusher could talk them silly. The guy manipulates one FBI agent into self-immolation, and another into a fatal heart attack, for crying out loud.
Who's your pick for most formidable "Monster of the Week"?