After cheating in the Springfield Marathon, Bart becomes the target of an angry mob. He is rescued by L.T. Smash, a boy band creator that wants Bart to be the rebel persona in his newest group. Bart, ready for stardom, joins Milhouse, Ralph and Nelson to form "The Party Posse". After getting some tips from the band 'N Sync, their first single and video debuts. Lisa soon discovers that the song contains hidden recruitment messages for the U.S. Navy. Things become chaotic when the Navy pulls the plug on "Project Boy Band", sending L.T. on a mission of vengeance. The Party Posse must team up with 'N Sync to help capture L.T. and restore order to Springfield.