Marge Simpson and her twin-sisters Patty and Selma Bouvier, and therefore wrote several episodes revolving around them. Executive producer Mike Reiss said on the audio commentary for Stern's season two episode "Principal Charming" (1991) that none of the staff members could relate on a personal level to the twins, but Stern "seemed to really hook in to them, so he did some great episodes featuring members of the Bouvier family." "Homer Alone" (1992), which aired during the show's third season, was one of Stern's episodes that focused on Marge. At the time, he had noticed that most of the writers were pitching stories about Bart and Homer, and he thought a "deeper vein of comedy" could be reached by having Marge suffer from a nervous breakdown. During the show's fourth season, Stern wrote the episode "Selma's Choice" (1993), in which Selma decides she wants a baby. He wanted to go back to a "Patty and Selma episode" because he enjoyed "Principal Charming" and thought it was important to "keep these characters alive." In 1999, Stern was nominated for a Primetime Emmy Award in the "Outstanding Animated Program (for Programming Less Than One Hour)" category for writing the season ten episode "Viva Ned Flanders", but lost to the episode "And They Call It Bobby Love" of King of the Hill. Stern's last writing credit to date on The Simpsons was the season twenty-eight episode "Kamp Krustier" (2017). Further work Stern was co-executive producer for the comedy drama detective television series Monk in 2002, and the sitcom Oliver Beene in 2004. In 2010, Stern developed the animated television series Ugly Americans that airs on Comedy Central and is based on a web series called 5ON. The series revolves around a social worker employed by the Department of Integration in an alternate reality version of New York City inhabited by monsters and other creatures. Stern has commented that "Dan Powell, who had put together the 5ON thing, contacted me because he liked a particular Simpsons script I wrote ["Duffless"]. I saw how I could keep the show grounded, but still make it expansive enough through this crazy world that I wouldn't get freaked out on episode three that I was out of stories. That's my biggest nightmare. If you're trying to create 100 episodes, you need to know you can go forever." Stern has commented that he considers Ugly Americans to be "a