TV Club: The Flash visits Earth-2 in a whirlwind episode that jolts the season back to life

The alternate universe episode featuring evil versions of regular characters is at least as old as ”Mirror, Mirror,” the Star Trek classic with a goateed Spock that Cisco (of course) mentioned tonight. “Welcome to Earth-2” is like “Mirror, Mirror” on Velocity-6. You just know the writers have been saving up ideas for this one all season; they were fired up and weren’t going to miss a trick. In only an hour, the episode navigates every possible twist and turn differentiating the two Earths, serving up several baskets worth of Easter eggs along the way. It was so much fun, I couldn’t be happier we get another hour of it next week.

This trip to Earth-2 couldn’t have come at a better time. Since its return from hiatus, The Flash has been sluggish and morose, and the Zoom arc has fizzled. “Welcome to Earth-2” jump-starts both the storyline …

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