There is an elegant substitute teacher in class today, but Katie's attempts to impress her keep going wrong.

It's Christmastime and Jack's new substitute teacher, Mr. Clausen, teaches the class how to make paper snowflake wishes, all the while reminding the class of another gentleman with a long white beard who enjoys a snack of milk and cookies.

Atticus Hobart couldn't feel lower. He's in love with a girl who doesn't know he exists, he is the class bully's personal punching bag, and to top it all off, his dad has just left the family. Into this drama steps Mr. Looney, a 77-year-old substitute English teacher with uncanny insight and a most unconventional approach to teaching. But Atticus soon discovers there's more to Mr. Looney's methods than he'd first thought. And as Atticus begins to...

Sam, Lucy, and Antonio have a new substitute teacher, who happens to be the great-great-grandson of Orson Eerie, the evil scientist whose spirit possesses and infects their elementary school--and the friends are afraid he may be trying to bring Orson back to life.

When sixth-grade classroom terror Jacob Wonderbar and his friends Sarah and Dexter find a spaceship crashed in the woods near their suburban neighborhood, their discovery leads them to a series of adventures including space travel, substitute teachers, kidnapping, and more.