Iris, The Happy ProfessorSeason 326 episodesEpisodes1SpaceSkeleton boards a rocket for a journey to the moon and the outer planets.2Musical InstrumentsMs. Principal coaxes everyone to form a band for an upcoming competition.3SnowThe 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.4FishMs. Principal brings a goldfish to the classroom. Iris and the class try to cheer it up.5DancingProfessor Iris is in a dancing mood, and so is Ms. Principal. Only Skeleton seems to go against the flow.6Cats7Wind8Presussion Instruments9I Feel Sick10Olympic Games11CastlesMs. Principal appears to be trapped in a castle turret, and it's up to Professor Iris and his class to try and rescue her.12Water13When I Grow Up14Cold Places15Rivers16Shoes17Friendship18Dinosaurs19I'm Scared20Games21Dreams22I Can Count23Hot PlacesThe 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.24TurtlesSkeleton 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.25GarbageSkeleton'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.26BoatsMs. Principal has found what appears to be a treasure map. Thus Skeleton and Plant board a boat, where Professor Iris holds his lesson.Season 1Season 2Season 4
