Official Description by The CW for Supergirl 4.18: "Supergirl and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Supergirl tries to befriend a nosy prisoner, Steve (guest star Willie Garson), who may have insight into what Lex was doing, but he and all of the prisoners regard her as a traitor to the country and refuse to talk to her. Lena realizes Lex left behind clues for her and deciphering them could be the key to his whereabouts. Meanwhile, Kelly encourages James to talk to someone about his PTSD, and Alex faces off against Ben Lockwood after he storms the DEO and acquires some powerful weapons to hunt Supergirl. Guest Stars include April Parker Jones (Colonel Lauren Haley), Azie Tesfai (Kelly Olsen), Bruce Boxleitner (President Baker), Andrea Brooks (Eve Teschmacher), Robert Baker (Otis Graves), Francoise Robertson (Sarah Walker), Parveen Dosanjh (Dr. Park), Reese Alexander (Warden), Jaymee Mak (Mackenzie), William Belleau (Angry Inmate), Jason Bempong (Moe), Michael Brian (Dan), Chris Cochrane (Lou), Norah Debra Dobbyn (Young Lena), Koby Holvik (Young Lex), Sean Kuling (DEO Guard), Mia Fiona Kut (Anne), Donald Sales (Platoon Captain), and Jesse Stretch (Bold Inmate)."
Supergirl stars Melissa Benoist (Kara Danvers/Supergirl), Chyler Leigh (Alex Danvers), Mehcad Brooks (James Olsen), David Harewood (J'onn J'onzz/Martian Manhunter), Jesse Rath (Querl Dox/Brainiac-5), Katie McGrath (Lena Luthor), Nicole Maines (Nia Nal), and Sam Witwer (Ben Lockwood). STORY BY: Rob Wright. WRITTEN BY: Lindsay Sturman and Aadrita Mukerji. DIRECTED BY: Antonio Negret.
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