Sasquatch! That's who Judy looks like in her school picture. Antarctica! That's where Judy's been sent three times in a single sour-ball week to chill out. Can Judy's mood get any worse? Well, duh! Of course it can. Unless it's Backward Day! That means it's time for Judy to turn that frown upside down, make lemonade out of lemons, and be nice to stinky little brothers. Can she stay in a good-not-bad mood for an entire day? How about seven whole days?...

Judy is excited about becoming a doctor, especially when Class 3T starts a new unit on the human body, but she learns more about being a patient when she catches tonsillitis from her little brother, Stink.