Krypton Aaron Pierre is Dev-Em

http://www.denofgeek.com/us/tv/krypton/241974/krypton-tv-series-unveils-new-teaser

"A cadet under the command of Primus Zod."

"Incidentally, Dev-Em is from the comics, and is one of the Phantom Zone criminals who periodically ends up on Earth to annoy Superman. Dev-Em was a background character in Man of Steel, for example."

""It's a show that, although it takes place centuries ago on Krypton about the House of El, it's about a conspiracy from the present that has traveled back in time to to Krypton to prevent Superman's legacy from ever happening," DC president Geoff Johns said at SDCC. "Adam Strange and Hawkwoman come to Krypton trying to stop the conspiracy and save Superman's legacy," Johns revealed. "Doomsday will be in the show. Brainiac is long overdue to be on screen like that.""