Surprise!

Summary
It's Catherine's 16th birthday, and Francine has been cordially UN-invited to the party. With the help of her friends, Francine whips up the perfect present for her big sister...a sneaky surprise with a side of payback!

Plot
Franncine is thinking about Catherine's birthday party which she discusses later with her dad, who tells her she's not invited. Francine gets angry and goes to confront Catherine. Catherine is annoyed, until her dad scolds Francine. The next day, her friends hear about it. Buster suggested putting stinky cheese in her jacket, Binky suggests putting glue in a bowling ball, and Muffy suggests they film Catherine and Sean, but Francine had something else in mind. At the party, Francine went in the speaker room and started to read from Catherine's diary, embarrassing her. The next day, Francine told her friends what happened. While she was reading, she felt bad and changed her mind and congratulated Catherine on a happy birthday. She also told them that she said Catherine loves Sean, prompting her to chase Francine, ending the episode.

Characters

 * Catherine Frensky
 * Muffy Crosswire
 * Francine Frensky
 * Prunella Deegan
 * Rattles
 * Alan Powers
 * Alex
 * Binky Barnes
 * Fern Walters
 * Alberto Molina
 * Chip Crosswire
 * Tami
 * Debi
 * Jenna Morgan
 * "Ballerina (Muffy Goes Metropolitan)"
 * "Unknown Elwood City Librarian"
 * "Unknown Female Adult Rabbit (Number 7)"
 * "3rd Grade Male Aardvark"
 * Buster Baxter
 * "Unknown Male Adult Rabbit (Number 4)"
 * Sean (teenager)
 * Oliver Frensky
 * D.W. Read

Trivia

 * This is the first episode to reveal Catherine's age.
 * Francine says that Sean looks like a rodent.
 * It is revealed that Catherine has a crush on Sean according to her diary.

Episode connections

 * Arthur and Buster wrote fake letters to Francine and Brain in "The Big Blow-Up". Muffy sent Chip a fake phone message from Catherine in "Matchmaker, Match Breaker". Chip is in attendance at the party.