Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.nnThe crossover starts on The Flash S05E09 Elseworlds (I) and Arrow S07E09 Elseworlds (II).
With Oliver and Barry still stuck in the other’s bodies, the two get a lead on John Deegan and head to Gotham City with Supergirl to figure out why their…
