Things to Come

The 1936 movie, Things to Come starts out on Christmas Day 1940 in 'Everytown'. War promptly follows, lasts for years, plunges the planet into the stone age til a group of engineers builds a new technocracy that saves the day - or does it.
Theoretically the Brits canned it because they didn't want any pesky anti-war sentiment when Germany & Italy were rattling their sabers.
Great apocalyptic holiday fare!