The Sun at Night
The tide of Soviet power washing across the face of the Earth could possibly have been turned back at various stages of history. But the new energy sources they discovered lit a fire under the Russian war machine. So when Stalin rolled into Paris, the resulting flare-up of global conflict left little more than smoking ash heaps where America and Great Britain had been.
Now, Stalin is dead. Though resistance movements have emerged, the Soviets still stand supreme as rulers of the globe. Only a force from beyond the earth could possibly tip the balance.