Supergirl 3x09 Extended Promo "Reign" (HD) Season 3 Episode 9 Extended Promo Mid-Season Finale

Supergirl 3x09 "Reign" Season 3 Episode 9 Extended Promo (Mid-Season Finale) - REIGN CHALLENGES SUPERGIRL – Supergirl (Melissa Benoist) investigates a mysterious symbol popping up all over