The Flash Season 4 will speed your way on the CW in Fall of 2017.
This isn't surprising, but it's pleasant news. The Flash Season 4 is already confirmed, even though we're only at the midseason break of season three.
The current season has been a marked improvement over the strange detours of season two, so confidence in The Flash Season 4 is pretty high around these parts, and obviously just as high at the CW. The show has been a consistent ratings performer since its debut, and even though the usual latter-season dips are making their presence known in the ratings, it remains one of the CW's strongest efforts.
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As for what kind of shape The Flash Season 4 might take? Well, it's a little early for that. But one thing has been teased a couple of times, and it's the kind of storyline that only makes sense for the latter seasons of a show like this one. I wrote a little bit more about that here, but there are major potential spoilers involved, so go there at your own risk.