Being in a warm climate, the chances of a white Christmas in Puerto Rico are next to none.
Then again, leave it to Sister Bertrille (Sally Field) of Convent San Tanco, alias The Flying Nun, to try the impossible. In "Wailing in a Winter Wonderland", she tries to help a visiting, ailing nun who wants at least one more white Christmas in her lifetime. Of course, chaos ensues.
Co-star Shelly Morrison (Sister Sixto) would make the most improbable comeback nearly 40 years later, landing a co-starring role on Will & Grace. Of the three sitcoms she made for Screen Gems, Flying Nun was by far the most successful series Sally Field had until a small screen comeback of her own with Brothers & Sisters a few years ago.