The "Supergirl" episode "Crisis on Infinite Earths" - Part One, is directed by Jesse Warn, airing December 8, 2019 on The CW:
"...'The Monitor' (LaMonica Garrett) sends 'Harbinger' (Audrey Marie Anderson) to gather the worlds' greatest heroes - 'Supergirl' (Melissa Benoist), 'The Flash' (Grant Gustin), 'Green Arrow' (Stephen Amell), 'Batwoman' (Ruby Rose), 'White Canary' (Caity Lotz), 'The Atom' (Brandon Routh) and 'Superman' (Tyler Hoechlin) - in preparation for the impending 'Crisis'.
"With their worlds in imminent danger, the superheroes suit up for battle while 'J'onn' (David Harewood) and 'Alex' (Chyler Leigh) recruit 'Lena' (Katie McGrath) to help them find a way to save the people of 'Earth-38'.
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