Everyone has a different favorite season discussed in this lesson.

A cow visits the classroom for Iris' lesson on cows and milk.

Everyone in class is having an uproariously good time laughing at Professor Iris's disguises.

Ms. Principal is unhappy with her new hairstyle.

Everyone in class has a different suggestion on where they can spend their summer holiday together.

Ms. Principal brings her baby to Professor Iris' class. This leaves everyone at a loss at trying to help the baby stop crying.

The class helps to spruce up a car that Ms. Principal is ready to display at an auto show.

In preparation for her concert, Ms. Principal joins Professor Iris in a loud-mouthed lecture on the voice.

Skeleton boards a rocket for a journey to the moon and the outer planets.

Ms. Principal coaxes everyone to form a band for an upcoming competition.

The classroom window id not closed, allowing a snow drift to clutter everything. It doesn't stop Professor Iris and the class from their lesson on snow.

Ms. Principal brings a goldfish to the classroom. Iris and the class try to cheer it up.

Professor Iris is in a dancing mood, and so is Ms. Principal. Only Skeleton seems to go against the flow.

Ms. Principal appears to be trapped in a castle turret, and it's up to Professor Iris and his class to try and rescue her.

The school's heating system has broken down, forcing everyone to bundle up. On top of that, Ms. Principal has a cold. Professor Iris whisks here to his magic chalkboard to experience the desert.

Skeleton can't fathom that a turtle could beat a hare in a race. Professor Iris whisks the entire class into the turtle's environment, where a turtle races Skeleton dressed as a hare.

Skeleton's ""little snack"" grew to four times what he really ate and about eight times the amount of garbage he thought he'd produce. With the classroom a mess, Professor Iris puts Skeleton on the job as a garbage collector.

Ms. Principal has found what appears to be a treasure map. Thus Skeleton and Plant board a boat, where Professor Iris holds his lesson.

Professor Iris is on vacation, so Ms. Principal is teaching the class. Throughout her lesson, she and the class receive letters from the Professor, who asks that all the stamps on the envelopes go to Piano's collection.