The series containing "Moe Goes from Rags to Riches" as the twelfth episode of its twenty-third season, released an anniversary episode that aired on February 19, 2012 entitled "At Long Last Leave", representing the show's 500th episode milestone.
"The Simpsons"' twenty-third season began airing on Fox on September 25, 2011, and ended May 20, 2012. 
 The show's 500th episode, "At Long Last Leave", aired February 19, 2012. 
"At Long Last Leave" is the fourteenth episode of "The Simpsons"' twenty-third season, and the 500th episode overall of the series. 
"Moe Goes from Rags to Riches" is the twelfth episode of the twenty-third season of the American animated sitcom "The Simpsons". 
