In the meantime, The Flash and Supergirl will next come together for a musical “Duet” in March, so stay tuned.
Sadly, producers have shot down that particular brand of crossover, citing the “floodgates of insanity” it might open.
It’s too early to know what next brings together Supergirl, Flash, Arrow and Legends of Tomorrow (did someone say Black Lightning?), but do producers have a point about alternate-universe doppelgängers over-complicating matters?
Producers ultimately abandoned the idea after a studio note deemed it “too confusing” and “one sci-fi problem too much.”