Supergirl 3x17 Extended Promo Season 3 Episode 17 Trailer/Preview #Trinity (2018) The CW

Supergirl S03E17 3x17/3x18 Extended Promo/Preview/Trailer/Sneak Peek/Inside (DCTV Superhero TV Show) Supergirl Season 3 Episode 17 Extended Promo Trailer Supergirl 3x17 Extended Promo "Trinity" (HD) Supergirl 3x17 "Trinity" Season 3 Episode 17 Extended Promo - SUPERGIRL TAKES ON ALL THREE WORLDKILLERS – Still reeling after learning about Lena’s (Katie McGrath) secret, Supergirl (Melissa Benoist) asks Guardian (Mehcad Brooks) for a favor that could alter his relationship with