Complex sentence: "Zero Sum" featured the final appearance in the series by Morris Panych; and saw the return of the virus-carrying bees which featured in the season-opener "Herrenvolk" and would later return in the 1998 feature film.
Split into simpler sentences: Zero Sum featured the final appearance in the series by Morris Panych. In addition, the episode saw the return of the virus-carrying bees which featured in the season-opener "Herrenvolk" and would later return in the 1998 feature film.