"Whodunit?" was the episode that introduced Debralee Scott as female Sweathog Rosalie Totsy, better known as 'Hotsy Totsy,' and none too thrilled to have a reputation of loose morals. The daughter of a reverend involves Kotter in her plan to teach the guys a lesson by falsely claiming to be pregnant, but refusing to name the father: "he knows who he is and he can step forward himself!" For the first time Kotter introduces his students as the Four Marx Brothers: 'Wacko, Jerko, Stupo, and Dummo!' When Rosalie tells the boys that one of them is responsible for knocking her up, they all slither out except for Arnold, who innocently proposes marriage because he wants her baby to have a name: "Horshack is a very old and respected name, it means the cattle are dying!" Kotter takes Rosalie home to meet his wife Julie, who walks in just as the girl is kissing Gabe on the cheek: "what she was doing was thanking me because she's gonna have a baby!" Rosalie's response to Julie's question about family planning: "you can't plan a family in a '57 Chevy!" All of the Sweathogs confess that they went out with Rosalie and that nothing ever happened, Washington admitting that he's never dated her (Epstein: "why'd you say you did?" Washington: "why not?"). Very controversial in its day and still trenchant now, but probably not the best way to abolish a bad reputation.