Muffy Gets Mature

Muffy Gets Mature is the second half of the 10th episode of Season 5. It first aired on November 6, 2000 along with Arthur's Family Feud.

Summary
Muffy hangs out with Catherine because Francine isn't mature enough. Catherine's friends don't receive Muffy well and they ridicule her because she uses "Mature Miss" as her guide for acting mature.

Trivia

 * This is the last episode to air before 9/11