Catastroclysm

Catastroclysm: noun. Quite literally the biggest disaster that could possibly, imaginably happen ever.  No event in history has even come close to being apt for this word to be used to describe it. If the super volcano underneath Yellowstone Nat'l Park ever does erupt, then the word may be a suitable choice, but even then it would be debatable. A potentially sufficiently-dangerous scenario would be if a meteor was crashing into the Earth as a pandemic was spreading across the globe, the super volcano was exploding and the Spice Girls were considering reforming for a come-back tour.