|Comic Appearances:||The Hard Goodbye|
|Film Appearances:||Sin City|
According to Marv he took it off the toughest kid he knew in school, who he implies that he killed. The name was inspired by a sister at the Catholic school he attended. (Whether this is the same school he got Gladys from is not strictly confirmed.) He states that the gun "almost lives up" to the reputation of the tough nun. Considering the amount of people killed by hand in the series, the only two people Marv killed with Gladys that we see during the series is The Priest and Stan Stan, the goon sent by Telly Stern, who "runs the tables over at the Triple Ace Club", who he shoots in the belly (and subsequently the crotch and head, respectively).