Don Rickles guest-stars as "Killer" Kiski, a mean-spirited physical fitness instructor who is convinced that astronauts Tony (Larry Hagman) and Roger (Bill Daily) haven gotten too soft for their own good. To whip our heroes into shape, Kiski subjects them to an exhausting exercise regimen during a wildnerness outing. Sense that her Master has been nearly exercised to death, Jeannie (Barbara Eden) attempts to save the day by trying to appeal to Kiski's "tender" side...assuming he has one! ~ Hal Erickson, Rovi