Supergirl Season 4 Episode 18: (Crime and Punishment)
WILLIE GARSON GUEST STARS — Kara (Melissa Benoist) and Lena (Katie McGrath) head to Stryker’s Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve (guest star Willie Garson), who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly (guest star Azie Tesfai) encourages James (Mehcad Brooks) to talk to someone for his PTSD, and Alex (Chyler Leigh) faces off against Ben Lockwood (Sam Witwer) after he storms the DEO and acquires some powerful weapons to hunt Supergirl.
Directed by: Antonio Negret
Story by: Rob Wright
Teleplay by: Lindsay Sturman & Aadrita Mukerji (#418).
Original US airdate (for Supergirl’s episode) 21 April 2019
Original Aus airdate: 22 April 2019