Syfy has rounded out the series regular cast for its Superman prequel pilot Krypton. Game of Thrones’ Ian McElhinney, Da Vinci’s Demons alum Elliot CowanAnn Ogbomo (World War Z), Rasmus Hardiker (Your Highness), Wallis Day (The Royals) and Aaron Pierre (Tennison) have joined the cast alongside leads Cameron Cuffe as Seg-El) and Georgina Campbell  as Lyta Zod).

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Based on DC Comics characters created by Jerry Siegel and Joe Shuster, Krypton is set two generations before the destruction of the legendary Man of Steel’s home planet. It follows Superman’s grandfather — whose House of El was ostracized and shamed — as he fights to redeem his family’s honor and save his beloved world from chaos.

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Courtesy of Syfy/Christopher Shintani/Jon Holloway

McElhinney will play Val-El, grandfather of Seg-El. He is a rogue genius who believes that space exploration is a basic form of self-defense, and he has tried, without success, to warn the Kryptonian elite about the arrival of an ancient threat. Cowan is Daron Vex, the Chief Magistrate of Kandor. His real business is defending Krypton’s established oligarchy against heretics and dissidents. Ogbomo will play Primus Alura Zod, Lyta Zod’s mother and a leader of Krypton’s military guild. She is an extremely tough and demanding training officer. Hardiker will portray the rankless Kem, is a brilliant engineer as well as Seg-El’s best friend and partner in an underground tech-repair business. Day will play Nyssa Vex, a junior magistrate and the daughter of Daron Vex. Pierre is Dev-Em, a cadet under the command of Primus Alura Zod.

McElhinney played Barristan Selmy in four seasons of Game of Thrones and also appeared for two seasons on The Fall.

Cowan previously starred as Lorenzo de’ Medici in Da Vinci’s Demons (created by Krypton EP David S. Goyer) and soonwill  be seen in the ITV drama series Innocent.

Ogbomo appeared in ITV’s Bouquet of Barbed Wire and the features World War Z and Honeytrap. This is her first series regular role in a U.S. television show.

Hardiker played Courtney in David Gordon Green-directed Your Highness.

Day recently shot a recurring role in Season 3 The Royals for E! and recurs in TNT’s upcoming drama series Will. She’s repped by Hamilton Hodell in the UK, UTA and Management 360.

Since his graduation this past summer from London Academy of Music and Dramatic Art, Pierre has appeared in the Prime Suspect prequel Tennison for ITV and Jez Butterworth’s Britannia for Amazon Studios and Sky Atlantic. He’s repped by Anonymous Content and Hamilton Hodell.

Goyer and Damian Kindler are executive producers of Krypton. Colm McCarthy serves as co-executive producer and director of the pilot, from a story and teleplay by Goyer & Ian Goldberg. Krypton is produced by Phantom Four in association with Warner Horizon Television.