Season 3

1. Space

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

2. Musical Instruments

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

3. Snow

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.

4. Fish

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

5. Dancing

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

6. Cats

7. Wind

8. Presussion Instruments

9. I Feel Sick

10. Olympic Games

11. Castles

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.

12. Water

13. When I Grow Up

14. Cold Places

15. Rivers

16. Shoes

17. Friendship

18. Dinosaurs

19. I'm Scared

20. Games

21. Dreams

22. I Can Count

23. Hot Places

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.

24. Turtles

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.

25. Garbage

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.

26. Boats

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