In this week’s episode of Supergirl Radio, Morgan Glennon and Rebecca Johnson discuss the Supergirl season three episode titled "Trinity"!  Official Description by The CW for Supergirl 3.17: "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 include Chris Wood (Mon-El), Amy Jackson (Imra Ardeen/Saturn Girl), Jesse Rath (Querl Dox/Brainiac-5), Angela Zhou (Dr. Grace Parker/Pestilence), Krys Marshall (Julia Freeman/Purity), Anjali Jay (Dark Kryptonian), Yuvraj Kalsi (Young Boy)." Supergirl stars Melissa Benoist (Kara Danvers/Supergirl), Chyler Leigh (Alex Danvers), Mehcad Brooks (James Olsen), David Harewood (Hank Henshaw/Martian Manhunter), Jeremy Jordan (Winslow “Winn” Schott), Katie McGrath (Lena Luthor), and Odette Annable (Samantha Arias/Reign). STORY BY: Jessica Queller. WRITTEN BY: Caitlin Parrish and Derek Simon. DIRECTED BY: Caitlin Parrish and Erica Weiss. You can find Supergirl Radio on: Social Media: Facebook – Twitter – Instagram  Subscribe: Apple Podcasts – Stitcher Radio – DC TV Podcasts - Google Play - Spotify Playlist - iHeartRadio Contact: supergirlradio@gmail.com  Support: TeePublic