<Ul> <Li> </Li> <Li> </Li> <Li> </Li> <Li> </Li> <Li> 5 </Li> <Li> 6 </Li> <Li> 7 </Li> <Li> 8 </Li> <Li> 9 </Li> <Li> 10 </Li> <Li> 11 </Li> <Li> 12 </Li> <Li> 13 </Li> <Li> 14 </Li> <Li> 15 </Li> <Li> 16 </Li> <Li> 17 </Li> <Li> 18 </Li> <Li> 19 </Li> <Li> 20 </Li> <Li> 21 </Li> <Li> 22 </Li> <Li> 23 </Li> <Li> 24 </Li> <Li> 25 </Li> <Li> 26 </Li> <Li> 27 </Li> <Li> 28 </Li> <Li> 29 </Li> </Ul> <P> "Oh Brother, Where Art Thou?" is the fifteenth episode of The Simpsons' second season . It originally aired on the Fox network in the United States on February 21, 1991 . In the episode, Grampa confesses that Homer has a half - brother, whom Homer immediately tries to track down . He eventually discovers that his brother is Herbert Powell, a car manufacturer . Herb immediately starts to bond with Bart and Lisa, and he invites Homer to design his own car . Homer's car design turns out to be a disaster, which causes Herb to become bankrupt . </P> <P> The episode was written by Jeff Martin and directed by Wes Archer . American actor Danny DeVito provided the voice of Herb . The episode features cultural references to cars such as the Edsel, the Tucker Torpedo, the Ford Mustang, and the Lamborghini Cheetah . Since airing, the episode has received mostly positive reviews from television critics . It acquired a Nielsen rating of 15.4, and was the highest - rated show on the Fox network the week it aired . Some fans were upset with the sad ending of the episode, and as a result the producers decided to write a sequel, "Brother, Can You Spare Two Dimes?", in which Herb regains his fortune and forgives Homer . </P> <P> After watching the latest McBain film, Grampa suffers a mild heart attack . Thinking he might die, he is prompted to confess a long - hidden secret: Homer has a half - brother . Grampa explains that he met a carnival prostitute before marrying Mona, Homer's mother, and they had a son that they left at the Shelbyville Orphanage . Determined to find his brother, Homer and his family go to the orphanage and find out that Grampa's love child was adopted by a Mr. and Mrs. Powell and named Herbert . </P>

Who was the voice of homer simpson's brother