Supergirl Season 3 Episode 17
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.
Guest Stars
Jesse Rath
Querl 'Brainy' Dox / Brainiac-5
Krys Marshall
Julia Freeman / Purity
Yuvraj Kalsi
Young Boy
Amy Jackson
Imra Ardeen
Anjali Jay
Selena