Beginning in 1990 with the show's second season, new episodes have aired every year since. Alien character Kang and Kodos appear in each episode. For obvious reasons, the Treehouse series falls outside of The Simpsons main canon.
Each toy in the series lights up.
- Mr. Burns
- Comic Book Guy
- Brazil: Os Simpsons, late-September start until at least mid-October
- Canada: The Simpsons, late-September start
- The Netherlands: The Simpsons, as of mid-October
- Spain: Los Simpson, active as of October 1 until at least mid-October
- United States: The Simpsons, late-September start