The powers: Super-speed
The actor: John Wesley Shipp
The run: 1990-1991
The villains: Corrupt officials and mobsters, Trickster, Captain Cold, Mirror Master
The tone: At first dark, gritty and relatively realistic, then with added comic-book villains.
Of note: Danny Elfman composed the theme song, and Mark Hamill played The Trickster. None of that could make up for the Flash looking like a 'roided out bodybuilder rather than a lithe runner with a super-speedy metabolism.