Unabridged. No messin' with my lesson: Katie's teacher, Mrs. Derkman, hopes to win the Teacher of the Year contest, but her chances do not look good when Katie turns into her teacher and cannot keep a class full of out-of-control third-graders in line. No bones about it: Katie and her third-grade class go on a field trip to the natural history museum where Katie finds herself magically transported into the body of their tour guide.