By rights, Head of the Class should have ended its run at the end of its fourth season, with the departure of series star Howard Hesseman. However, ABC decided to film a fifth and final season as a back-up, in case any of their new programs of the 1990-1991 season should be prematurely canceled. As it turned out, the network's new sitcom Baby Talk was not quite ready for prime time in September, thus Head of the Class was hastily inserted into the schedule until the production problems on the other series could be ironed out. In the season opener, it was explained that Hesseman's character, Fillmore High School substitute teacher Charlie Moore, had quit his job to pursue a full-time acting career. Thus, the genius-level students in Moore's Individual Honors Program now had a new teacher, a flamboyant Scotsman named Billy McGregor (played by Hibernian comedian Billy Connolly). Like Moore, Mr. McGregor was dedicated to instilling in his brilliant charges the emotional maturity and social skills that they would need when finally released into the real world. Unlike Moore, McGregor conducted his classes as though he were performing a monologue at the local comedy club. He also tended to become more involved than your average teacher in the students' off-campus lives, notably in the episode "Viki's Torn Genes," in which he helps student Viki Amory (Lara Piper) locate her birth mother -- with surprising results. Occasionally, his unorthodox methods backfired disastrously, notably in the two-part episode in which, after McGregor lectures the kids on the proper way to protect themselves from being mugged, nerdish Arvid (Dan Frischman) is inspired to purchase a gun! Head of the Class was canceled mid-season on January 15, 1991, only to return on May 28 with five new episodes, all of them leading up to the series finale when the IHP class finally graduates -- not so much because it is high time that they did so (which of course it is), but because Fillmore High is about to be demolished. In the last episode, the two-part "It Couldn't Last Forever," the IHP kids try to figure out who among a classroom full of geniuses will be chosen to deliver the valedictory speech. This terminal episode marks the brief return of former regular Tannins Valelly in the role of child prodigy Janice Lazarotto. ~ Hal Erickson, Rovi