Flash (whose real identity is Barry Allen) is a super hero in DC comics, regarded as the fastest man alive. Using his super-speed powers, he taps into the Speed Force and becomes a costumed crime-fighter.

Batman: Arkham Knight

In a Hardwick Tours poster advertising "Run to Keystone", a red streak can be seen traveling in the street, assumed to be Flash.
Batman Arkham Knight- The Flash Easter Egg01:53

Batman Arkham Knight- The Flash Easter Egg

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