During class, Buttercup disrupts one of Ms. Keane's lessons. But just as Keane's about to punish her, she spots a rainbow outside and suddenly calms down and dismisses class. She isn't the only one affected; The rest of the citizens are also overly happy, but this soon leads into them not realizing what they're doing, and destroying Townsville in the process. The girls try find out what's going by on following the rainbow into the clouds, where they meet Allegro, a panda who wants everyone to be happy.
Tropes:
- Acid-Trip Dimension: Allegro's domain. More or less.
- An Aesop: Fun's great and all, but there's a time and a place for it.
- Bears Are Bad News: Allegro, who's a panda bear, albeit a cosmic one.
- Brainwashed and Crazy: The whole of Townsville thanks to Allegro's rainbow. Blossom and Bubbles likewise get hit with this too.
- Getting Smilies Painted on Your Soul: Allegro's ability.
- Happiness Is Mandatory: Pretty much a rule in Allegro's domain.
- I Can't Believe I'm Saying This: Bubbles where she gets dog-piled by her classmates hugging her.Bubbles: I never thought I said this but, I can't take anymore hugs!
- I Want My Beloved to Be Happy: Allegro, in a mean version of the trope.
- Ironic Echo: Buttercup, when she realizes what Ms. Keane was trying to teach her about having fun at appropriate times...
- Jerkass Realization: ...Which leads into this.
- Shaking the Rump: Blossom, Bubbles, and Allegro do this, much to Buttercup's disgust.
