While Fred is out sick, a visiting author signs Fred's book "To Frank". When Fred's desk-mate Luisa suggests Fred must really be Frank in school, this sparks an idea for Fred's creative writing assignment. Fred's What-If poem is coming together wonderfully, until--a mist fills the room and the writing assignment comes to life. Suddenly Fred--now Frankinschool--and Luisa--now Princessa Luisa--need to save the school from the mysterious potion--and...