The Friend Who Wasn't There: When Muffy hears D.W. talking to Nadine, she explains this to the gang, and Arthur says that Nadine is only D.W.'s imaginary friend. Muffy and her friends talk about their imaginary friends. Buster has 5, excluding one of them mentioned in "Read and Flumberghast", Arthur replies his bear Stanley was his imaginary friend, and Francine's imaginary friend was an alligator who always told mean stories about Catherine, Francine's older sister. Muffy searches for her imaginary friend, and the episode focuses on her imagination until Bailey comes, and the name is revealed to be Waldo. Surprise!: Francine is un-invited to Catherine's 16th birthday party and she and the gang try to come up with flaws to make it the worst party ever. The episode focuses on Francine, who opens her heart about everything mean Catherine has done. Her flaw is to sneak in during the party and takes Catherine's diary and explains it to the whole party! Then Francine makes it sound like she didn't mean it. Except that it was fake. The real plan was to tease Catherine, who is angry enough to chase her and Francine out of the party after the teasing.