Supergirl Season 3 Episode 4 - The Faithful <br /> <br />Kara investigates a secretive new group whose leader, Thomas Coville, has a mysterious connection to Supergirl. Meanwhile, Samantha feels like she's letting Ruby down, and J'onn confesses an old secret. <br /> <br />Supergirl 3x04 The Faithful - Inside doc <br /> <br />The adventures of Superman's cousin in her own superhero career. <br /> <br />Creators: Ali Adler, Greg Berlanti, Andrew Kreisberg <br /> <br />Stars: Melissa Benoist, Mehcad Brooks, Chyler Leigh
