"Betty" is the forty-eighth episode of the fifth season of the American animated television series "Adventure Time".
 It was written and storyboarded by Ako Castuera and Jesse Moynihan, from a story by Kent Osborne, Pendleton Ward, Jack Pendarvis, Adam Muto, and Moynihan.
 It originally aired on Cartoon Network on February 24, 2014.
 The episode guest-stars Lena Dunham as the eponymous character, Betty.
 The entry also saw the return of Miguel Ferrer, Steve Agee, Duncan Trussell, and Maurice LaMarche as various characters.
Tiny Furniture is a 2010 American independent comedy-drama film written, directed by, and starring Lena Dunham.
 The film premiered at South by Southwest, where it won the award for Best Narrative Feature, screened at such festivals as Maryland Film Festival, and was released theatrically in the United States on November 12, 2010.
 Dunham’s own mother, the artist Laurie Simmons, plays Aura’s mother, while her real sister, Grace, plays Aura’s on-screen sibling.
 The actors Jemima Kirke and Alex Karpovsky would also appear in Dunham's television series "Girls".
The Walking Dead: Survival Instinct is a single-player post apocalyptic first-person shooter video game developed by Terminal Reality and published by Activision.
 It is based on and canon to "The Walking Dead" television series, in contrast to the video game by Telltale Games, which is based on and canon to the comics.
 "The Walking Dead: Survival Instinct" acts as a prequel to the TV series; it is set in the Georgia countryside and focuses on Daryl and Merle Dixon as they make their way to Atlanta during the early days of the zombie apocalypse.
 The critical reception for "The Walking Dead: Survival Instinct" was received poorly, with criticisms mainly directed to the game's graphics, control, and plot.
Lena Dunham ( ; born May 13, 1986) is an American actress, writer, producer, and director.
 She is best known as the creator, writer and star of the HBO series "Girls" (2012–2017), for which she has received numerous Emmy Award nominations and two Golden Globe Awards. Dunham's work on "Girls" also led her to become the first woman to win the Directors Guild of America Award for Outstanding Directing – Comedy Series in 2013.
 That year Dunham was included in the "Time" 100 list of the most influential people in the world.
 In 2014, Dunham released her first book, "Not That Kind of Girl: A Young Woman Tells You What She's "Learned"".
Doreen St. Félix (born 1991/1992) is an American writer.
 She currently writes for "The New Yorker", and was formerly editor-at-large for Lenny Letter, a newsletter from Lena Dunham and Jenni Konner.
 She has also written for "The New York Times Magazine", and "Pitchfork".
 In 2016, "Forbes Magazine" named St. Félix to its 30 Under 30 list, citing her work on the "Lenny Letter" launch with the newsletter reaching 400,000 subscribers in under six months. "
i-D" called her "a guiding voice in the worlds of writing, art and activism." "
Brooklyn Magazine" named St. Félix to its 2016 list of the "100 Most Influential People in Brooklyn Culture," calling her Pitchfork essay on Rihanna "definitive." "
The Huffington Post" named the same essay to its list of "The Most Important Writing From People Of Color In 2015;" NPR called it "excellent" and "Paper Magazine" described it as "the best damn thing ever written re.
 Rihanna."
The fifth season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on November 12, 2012 and concluded on March 17, 2014.
 The season was produced by Cartoon Network Studios and Frederator Studios.
 The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will.
 Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess.
"I Wanna Get Better" is a song by American indie pop act Bleachers.
 Written and produced by frontman Jack Antonoff and John Hill, it was released as the lead single from Bleachers' debut studio album "Strange Desire" on February 17, 2014, through RCA Records.
 "I Wanna Get Better" topped the "Billboard" Alternative Songs chart, becoming the band's first number-one single, and also reached the top ten of the Hot Rock Songs chart.
 Its accompanying music video stars Antonoff as a therapist and was directed by his girlfriend, actress and filmmaker Lena Dunham.
Girls is an American television series that premiered on HBO on April 15, 2012.
 Created by and starring Lena Dunham and executive produced by Judd Apatow, "Girls" is a comedy-drama following the lives of four young women living in New York City.
 The show's premise and major aspects of the main character—including being cut off financially from her parents, becoming a writer and making unfortunate decisions—were drawn from Dunham's own life.
 Apatow said he was drawn to Dunham's imagination after watching her independent feature film "Tiny Furniture" (2010), and added that "Girls" would provide men with an insight into "realistic females".
"Girls" is an American comedy-drama television series created by Lena Dunham, who serves as executive producer along with Judd Apatow and Jenni Konner.
 The series premiered on HBO on April 15, 2012.
 "Girls" stars Dunham as Hannah Horvath, an aspiring writer in her 20s trying to navigate her personal and professional life in New York City after her parents discontinue their financial support.
 Allison Williams, Jemima Kirke, Zosia Mamet, Adam Driver, and Alex Karpovsky co-star as Hannah's circle of friends, who are also trying to figure out their own lives and relationships.
 During the course of the series, episodes of "Girls " aired over seasons.
Fire Brats is a series of children's books about two teenagers, Matt and Dani, who both survive post apocalyptic World War 3.
 The books were written by Barbara Siegel, Scott Siegel and Barbara Steiner.
 The first book, "The Burning Land", was published in 1987.

Question: Lena Dunham guest stars as "Betty" on the 48th epidsode of a tv series set in what post apocalyptic land? 
Answer: Land of Ooo