Supergirl (2015)
S4E9 Elseworlds (III)
Episode Overview
Supergirl, The Flash, Green Arrow, and Superman find themselves in the fight of their lives. This epic crossover kicks off with The Flash Season 5, Episode 9, titled "Elseworlds (I)," and continues in Arrow Season 7, Episode 9, "Elseworlds (II)."
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S4