Krypton Ian McElhinney is Val-El

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

"Ian McElhinney (Barristan Selmy on Game of Thrones) will play Seg-El's grandfather, Val-El. According to Deadline, Val 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." Could that be Brainiac? An earlier TV Line description said "Seg’s genius grandpa defied death by going into the Phantom Zone, and is a staunch believer in space exploration.""

""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.""