Lady Gaga set for Simpsons finale The Simpsons is the longest-running prime-time scripted programme on US TV and is contracted to run for another two seasons. The episode entitled 'Lisa Goes Gaga' will feature Lady Gaga visiting Springfield to cheer up Lisa and Lady Gaga has said: "I play a little bit of a slut. The apple doesn't fall far from my artistic tree. Previous cameo appearances on the show include Tony Blair, Simon Cowell, The Beatles, and Dustin Hoffman. The Simpsons' creator Matt Groening has said he still wants to take the show forward, adding: "Mostly it's revealing back stories of some of the characters we've never dealt with. We have a character we call Squeaky-Voiced Teen, which is [Dan] Castellaneta doing a 1940s Hollywood teenager. We've never given him a name; I'd like to know a little bit more about that guy. In the 500th episode, which featured a reworking of the theme song by Grammy winner Alison Krauss, the cartoon family were exiled to a community of outsiders where they met Wikileaks founder Julian Assange.