DC Comics fans will be relieved to know that the new CW series “The Flash” is not a dud. Debuting Tuesday night at 8, the “Arrow” spinoff stars Grant Gustin (“Glee”) as super-fast superhero Barry Allen. The tone is also a little lighter than on “Arrow.” Jesse L. Martin (“Law & Order”) plays Barry’s boss, Det. Joe West, and Tom Cavanagh (he’ll always be “Ed” to me) plays troubled scientist Dr. Harrison Wells.
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