This follow-up to an episode of Happy Days sees the girls posing as fiancées to the Fonz and Richie Cunningham to save them from having to marry two farm girls.

To get a free vacation, the girls apply to be counselors at a 'fat farm'. A nasty female trainer named Bambi wants the jobs for her sisters and takes revenge by giving the two harsh tests of will power against eating. It's do or diet.