Supergirl 6x15 Sneak Peek "Hope for Tomorrow"

Supergirl (Melissa Benoist) continues to fight Nyxly (Peta Sergeant) for the remaining totems but after Nyxly kidnaps William (Staz Nair), Supergirl realizes she needs to take a more proactive stance to keep National City safe. Meanwhile, Alex (Chyler Leigh) faces the biggest challenge of her life.