Supergirl – Nightmare In National City Stills [ Written on October 13 2021 by Vicki ] I have added stills from epsiode 16. Home > Television Productions > Supergirl (2016-2021) > Season 6 > Episode Stills > Nightmare In National City Images Supergirl next postNew Design previous postSupergirl – Hope For Tomorrow Promo Leave a Reply Click here to cancel reply. Name (required) Email (will not be published) (required) Δ