Judy Moody has got the Moody Monday blues - until she finds out that Class 3T's new project is on the amazing human body...That means skeletons and skulls, a trip to the hospital, lots of medical jokes and double trouble when Judy's friends trick her into thinking the class guinea pig has been cloned.

Then Judy catches the mumps off younger brother, Stink, but all is well in the end when her friends make up by coming to visit.