The Flash Season 4 Promo seppinrek / September 1, 2017 A new promo for season four of The Flash is out and it looks like Barry will have to use his mind, more than his speed, to outhink The Thinker! The Flash season 4 premieres on October 10 at 8:00 pm. Share this:EmailPinterestTumblrRedditMoreFacebookTwitterLike this:Like Loading...