Flash's Most Underused Power Would Be Any Other Hero's Entire Identity
Despite being the Fastest Man Alive, the Flash has more than just the ability to run incredibly quickly. While his capacity to run at impossible speeds is his most famous power, writers have long worked hard at giving the character other applications to his super speed, from dimensional travel to superheated hands. In fact, a number of his ancillary powers could end up being a central power for any other hero.
Both of the most famous versions of the Flash — Barry Allen and Wally West — received their powers through accidents involving lightning hitting chemicals. However, in the 1990s at the height of Wally's popularity as the Flash, there was the introduction of a mysterious universal energy known as «the Speed Force» that opened up the cosmic implications of how the Flashes' powers work. This opened up the Scarlet Speedster to whole new avenues of powers tied to his speed to include the "infinite mass punch" and a rapid healing factor. Any single one of these applications could be sufficient on their own to make a superhero incredibly powerful.
Related: The New Flash Has Finally Mastered a Forgotten Speed Force Power
However, some of these bizarre powers manifested long before the Speed Force was revealed in the comics. This includes the common Flash ability in the Silver Age to vibrate his molecules at high frequencies to gain intangibility and pass harmlessly through solid objects. Another such ability seen during the same time was Flash's ability to simulate flight by running on top of the water vapor of clouds. One ability that rarely gets mentioned is that Flash is able to vibrate his molecules to such a degree as to render himself functionally invisible, even while standing still — something he used to use
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