On Kefen A, the natives are quite sure of one thing. The Universe and Kefen always were, always are, and always will be. Notions of worlds getting shattered are for morons. Catastrophes with unique or genuinely world-changing dimensions do not happen.
The natives are short, a bit pudgy, green-skinned with a cooling fin of darker green rising a foot above the head which rests at four foot tall. They have no incisor or canine type teeth; instead they only have molars which works as they are vegetarians.
Kefenites have very little genetic diversity which necessitates the approval of the Genetic Board before anyone can be married. Some kooks regard this as proof that at some distant point in the past, most Kefenites were wiped out, and a very few bloodlines repopulated the planet. These whackos also point out the deep damage from canyons, the circular gulfs, the volcanoes, and the massive amounts of extinct animal fossils all layed out as if they had been swept up by massive amounts of water, and then the water had slowed as it hit a sandbar or a mountain range.
But there are very few of these kooks.
Unfortunately, there is an ancient prophecy that the Angel of the Last Days shall appear amidst corn, and he shall stand tall above mortal men with a skin like (pale as death, dark like the night, or yellow like the last sunrise which he heralds). In other words, there is a prophecy that when the verser arrives in a cornfield that things are about to get Really Bad.
These 'kooks' (and some of them are) will try to meet the person there will be strange rumours about (because the verser looks so obviously alien).
Later, there will be another problem...a comet is headed inwar. With hapless fearlessness, the locals prepare for a comet-watching party.
But, they're about to get a closer look than they want. The only thing that can save them is the partially built Kook spacship, and a stolen nuclear warhead.
And this is a Uniformatarian theory world about to receive an educaton in Catastrohphism.