Madge is the true main villainess from "Mr. Monk Goes to the Bank", from the sixth season of Monk.
She was played by Eve Gordon, who later appeared in Supernatural episode 9.12 as Joy Meyers .
Madge is one of the villainous bank tellers at West Bay Trust Bank, along with Leon, Jasmine, Tiffany, and Gloria. The five of them, along with bank president Peter Crawley, colluded together to rob their own bank. As Monk would later state in his summation, each person had a role to play. In the case of Madge, she played the actual gun wielding robber, with a Russian accent, and she held Crawley at gunpoint and later shot Jasmine before committing the robbery. As for Jasmine being shot, the six of them drew straws (toothpicks) and Jasmine drew the short straw, thus she had to be the one to be shot to make the set-up look good. Crawley was later murdered after the heist, most likely because he broke a supposed pact to not spend the money by buying a convertible; though it is never confirmed which of the tellers killed him.
Madge later allowed Monk (with Natalie, Randy, and Stottlemeyer) into the bank after it was closed, hoping to find Trudy's bracelet in his safe deposit box. While in the vault, Monk discovered the six toothpicks on a table, and after catching Monk in her video camera, the villainous Madge closed the door of the vault, sealing the quartet in and establishing Madge's heel turn. The group was eventually rescued, and Madge and the other tellers were all arrested.