The Flash #173

September 1967's The Flash #173 poses an irresistible mystery right on its cover: three speedsters — the scarlet-clad Barry Allen Flash, the yellow-suited Kid Flash, and a figure in the classic golden-age red-and-blue — race across a series of panels that count down from three Flashes to two, to one, and finally to none. The stark black background and bold orange numerals give the whole thing an urgent, almost ominous countdown feel that's hard to resist. With cover pencils by Carmine Infantino and inks by Murphy Anderson, and John Broome's "Doomward Flight of the Flashes!" waiting inside, this is Silver Age DC firing on all cylinders.