For years, fans had entertained the possibility of Gustin and Miller crossing over in some capacity, and they got their wish completely by surprise in early 2020, when Miller made a secret cameo in The CW's "Crisis on Infinite Earths" crossover.
For years, fans had entertained the possibility of Gustin and Miller crossing over in some capacity, and they got their wish completely by surprise in early 2020, when Miller made a secret cameo in The CW's "Crisis on Infinite Earths" crossover.