The twenty-third season of the American animated television series The Simpsons began airing on Fox on September 25, 2011, and ended May 20, 2012. The showrunner for the season was Al Jean, with three episodes ran with Matt Selman, one of those he also wrote himself. The show's 500th episode, "At Long Last Leave", aired February 19, 2012.

"At Long Last Leave" is the fourteenth episode of the twenty-third season of the American animated television series The Simpsons, and the 500th episode overall of the series. In the episode, the Simpsons discover that the inhabitants of Springfield have grown tired of them and have secretly decided to throw them out of the city. After being evicted from Springfield, the family members end up in a rugged place without rules and regulations called the Outlands. There, they briefly come across their neighbor Julian Assange, who created WikiLeaks. Assange guest-starred in the episode as himself and recorded his lines over the phone while under house arrest in Britain, while waiting for the results of Assange v Swedish Prosecution Authority.