I think a nice intro movie would give this game some flavor (could even be a trailer for the game using mixed ingame action)

Im thinking a Back drop of what has brought us from world we Knew to the Apocolypse we KNOW now (big nukes hitting cities and other world coming apart stuff)

And I was thinking how awesome it would be to use "Charlton Hestons on climate change" (the one on youtube where he reads the fore ward of jurasic park ) while the movie of the "End" was being played at same time