FLASH #123 "Flash of two worlds"

The Flash meets the other Flash in this historic re-creation of Flash of Two Worlds! When Barry Allen's vibrational powers tear a hole between realities, he inadvertently winds up on Earth-Two--home to speedster Jay Garrick. But before Barry can go home, he'll have to help Jay contend with a trio of terrors in the form of the Thinker, the Fiddler, and the Shade!