The Flash Season 4 Episode 4 – Elongated Journey into Night, October 31, 2017
Not much information has been revealed about this episode. From the internet and from reliable sources, all we know that is this one will feature quite an extraordinary plot and viewers will be surprised.
Also Check : The Flash Season 4 Episode 3
Probability is that, Iris will confront Barry this time and we will get to know the real reason behind his weird behaviour with his allies. So, tune into CW when it releases. (Eagerly waiting for the teaser)