A comet was speeding quickly to the sun, threatening all life on Earth. However, no such event ever occured on Earth, so how could this be? Simple... since we're talking about the Flash of Two Worlds, this is evidently the sun of Earth-Two in a parallel universe from our own. Enlisted to find a solution to this dire calamity, as the radiation emitted from the sun due to the comet's exposure steadly increased, Jay Garrick unretired his alter ego once more and tracked down a lead to Arizona and an ancient meteorite that fell to Earth aeons ago. Apparently, its material could absorb the toxic radiation, however it was now nowhere to be found! Where could this fleet-footed fellow find more of such material? Simple, since we're talking about the Flash of Two Worlds, he need only journey to Earth-One and borrow the meteorite remnants from that world. To do this, he enlisted the aid of his new friend, Barry Allen aka the Flash there!
Turns out Barry was in the midst of his own crisis, albeit far less serious than that taking place on Earth-Two. Central City was being afflicted with a mini-crime wave, and behind these foul deeds were the villains known as Captain Cold and the Trickster. Just as Barry-Flash tried, unsuccessfullly, to defeat the devious duo, Jay-Flash chopped up the meteorite in that world's Arizona and had it transported back to Central City where he could then teleport it to his native Keystone City. In the interim, the Scarlet Speedsters used the fragments to lure the two felons into a trap. With the pair caught, Jay returned to Earth-Two and transformed the fragments into a gaseous substance that shielded his world from the hazardous radiation. Analyzing the meteorite material, he created a synthetic duplicate before the gases had evaporated... as had Jay's own meteorite... for Barry to use later when a comet in his solar system crashed into his sun. A twice-told-tale, indeed!