From 1986 until 1990, there was a show that aired on ABC that dealt with a substitute teacher who taught a group of very smart students. The show was titled "Head of the Class," and featured Howard Hesseman as the great Charlie Moore, the substitute teacher who took over the Individual Honors Program (IHP) at Fillmore High School, and cleverly taught his students valuable life lessons, and especially how to "think outside the grades." The show underwent some cast changes in its 4th season when three of the original students left, and were replaced with new students. But, the biggest change by far occurred in the shows 5th and final season, when Howard Hesseman left the series. While teaching the Fillmore High School IHP was a love of the Charlie Moore character, it played second fiddle to the first love of his life - acting and dramatics. And so, in the 5th season premiere, it was revealed that Charlie Moore left teaching to pursue an acting career, and he was replaced by an Ivy L