The Party Posse
After taking on rock, country, and barbershop, The Simpsons finally get around to manufactured boy bands in the "New Kids on the Blecch" episode (25 Feb. 2001).
In the episode, Classified Records producer L.T. Smash (who put together Boyneudo and New Kids In a Ditch) turns Bart Simpson, Milhouse Van Houten, Nelson Muntz, and Ralph Wiggum into a quartet of preteen crooners, thanks to studio magic and songs like "You're My Special Girl" and "I Gotta Spell Out What I Mean." Unfortunately, as Lisa Simpson discovers, the band is really part of the U.S. Navy's Project Boy Band, and has subliminal messages and backward masking (Yvan Eht Nioj) in their songs ("Drop Da Bomb" and "Let's Re-Up Tonight") to brainwash the youth of America to join the Navy. The band ends when the Navy tries to stop the project before a planned Mad Magazine spoofing, only to have L. T. Smash (really Navy Lt. L.T. Smash) go nuts and kidnap the band and destroy the Mad offices.
Real group N'Sync guest starred as themselves.