SPOILERS ahead for The Flash season 4 and Arrow season 6
The season 4 premiere of The Flash seemingly reveals two Arrow characters who survived the explosion on Lian Yu in the latter show’s season 5 finale. Ever since Barry Allen (Grant Gustin) was introduced to The CW’s DC TV universe and spun off into his own television series, the network’s Arrowverse lineup has often used crossovers and references to its other series to establish a shared world. While this includes major events like the annual four-show crossover between Arrow, The Flash, Supergirl, and Legends of Tomorrow, it also includes cameos or characters name dropping each other.
When each of the Arrowverse shows …
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