Season 4

Season 4 of premiered on October 4, 1999  on PBS. This was the first season in which only 10 episodes (20 segments) were produced per season, a pattern that would not be broken until Season 20.

This was the first season to use digital ink and paint, although the color palettes for the characters remained the same until Season 6, when they were given brighter colors.

This is the last season to feature voice actor Luke Reid as Brain, as his voice matured even more, and the first to feature Oliver Grainger as the voice of D.W. Head writers Joe Fallon and Ken Scarborough also left the team after this season, though Scarborough would return as a writer starting in Season 9.