Strange images point to apocalyptic prophesies of doomsday; a top-secret nuclear arsenal in Russia; a deadly crater in the Arctic; a looming natural disaster in California.

From sea to shining sea, the United States is home to some of the most perplexing mysteries on the planet; strange spots cover a vast stretch of desert near the Grand Canyon; a Los Angeles water reservoir unexpectedly turns black. This episode is a mashup of segments from S03E12, S03E08, S02E02, S03E01 and others.