Supergirl 3x17 "Trinity"

Still reeling after learning about Lena's secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.
Directors: Caitlin Parrish, Erica Weiss
Writers: Jerry Siegel (based on characters created by), Joe Shuster (based on characters created by) | 6 more credits »
Stars: Melissa Benoist, Mehcad Brooks, Chyler Leigh