is one of only a handful of recurring characters (and no regulars) whom Beckman is comfortable with addressing her by her forename, Diane. Mary and Casey take up arms against their government colleagues in Castle in "Chuck Versus the Cliffhanger". With Sarah's life in the balance, Mary sends Chuck out an emergency exit with prisoner Hartley Winterbottom (revealed to be Volkoff's true identity) and false passports, never expecting to see her son again. With Chuck safe, Mary and Casey manage to escape as well. The pair - joined by Morgan, the two remaining CAT Squad members whom he called, and Chuck - engage in another armed stand-off with their CIA colleagues who intend to stop Chuck from delivering an antidote to Sarah. Mary, like the others, is spared from execution or criminal prosecution by Chuck's blackmail threat to reveal to the media the actions taken by their adversary, Clyde Decker; it is not known whether her employment was terminated along with that of Chuck, Sarah and Casey. Mary reappears in the Series finale "Chuck Versus the Goodbye" where she gives Chuck information on how to stop Nicolas Quinn from reassembling the Key, a device which can modify the Intersect. Development Speculation on who would be portraying Mary began immediately after her appearance in the third season finale, and Hamilton's casting was announced during the Chuck panel at Comic-Con 2010. Personality Josh Schwartz has revealed that when Mary appears in the season four premiere, "Chuck Versus the Anniversary", she will have an "intensity" of which Hamilton is "a natural fit." Not only will she bring a fanboy-friendly resume to the show, but she will be "kicking ass right out of the gate." Very little has been definitively established about Mary's personality and loyalties in the series itself. She ruthlessly killed several of Volkoff's henchmen in "Chuck Versus the Anniversary" after being told by Marco that her family is looking for her, and in "Chuck Versus the Cubic Z" she is referred to as "Frosty the Snow Bitch" by Heather Chandler. In "Chuck Versus the Coup d'Etat" Premier Goya of Costra Gravas described her as a "kept woman" of Volkoff, and MacKintosh described her in "Chuck Versus the Couch Lock" as Volkoff's "right hand," the woman who Volkoff sends to make his problems disappear. When Mary contacts Chuck in "Chuck Versus the Aisle of Terror" she expresses little emotional interest in Chuck's