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S21E13 - The Color Yellow - February 21, 2010

Next episodes

S21E14 - Postcards From the Wedge - March 14, 2010
S21E15 - Stealing First Base - March 21, 2010
S21E16 - The Greatest Story Ever D'ohed - March 28, 2010

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Summary

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.