Muffy Gets Mature

"Muffy Gets Mature" is the second half of the 10th episode of Season 5. It first aired on November 6, 2000 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.