<P> Ratings slipped greatly in the third season . Kaplan later attributed the decline to the age of the actors playing the Sweathogs, all then in their mid to late twenties, claiming that they were no longer believable as high school students . His idea was to have Kotter join the faculty of a community college attended by the Sweathogs; however, this storyline never materialized . In order to increase viewership, the Kotters had twin girls, but this did not prove to be enough to regain the show's earlier momentum . The show introduced a female Sweathog, Angie Grabowski, played by Melonie Haller . </P> <P> Major changes took place in the fourth and final season . </P> <P> Shortly before the season began, the series was moved from its successful Thursday 8: 00 pm time slot to Monday 8: 00 pm to make way for the impending hit series Mork & Mindy . </P> <P> Virtually the entire writing staff was fired after season 3, and replaced with veteran writers from family - based series (such as Bob Claver from Leave It To Beaver and The Munsters). </P>

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