The Simpsons

Last episode

S21E23 - Judge Me Tender - May 23, 2010

Next episodes

S22E01 - MoneyBart - September 26, 2010

Summary

The Simpsons
The FOX network's most successful series to date was a spin-off from The Tracey Ullman Show. Originally appearing as a 1 minute filler, the executive producers of that show, James L. Brooks & Sam Simon, decided that these characters could support a half hour series. So they did it, and started the longest running animated series in television history.

Official web page
Summary at tvrage.com