Krypton

Krypton is an American television series developed by David S. Goyer for Syfy in 2018. The story focuses on Seg-el, the grandfather of Kal-el aka Superman and takes places 200 years before the planet Krypton explodes. The house of El has been disgraced and Seg-el fights to regain the status of the house back, all the while fighting against famous villains Brainiac, Drew Zod (aka General Zod), and Doomsday.

Civil Wars; Transformation (Season 1, Episodes 6-7)
At the end of Civil Wars, the Voice of Rao reveals himself to be infected by and transforming into Brainiac to the Sagitarii Guards who have come to kill him. He then releases tentacles from his arms that implant themselves in the foreheads of the Guards; the tentacles begin conditioning the guards at the start of Transformation. The Sagitarii Guards are conditioned to be the "instruments of Brainiac's will;" with the condition complete, the tentacles withdraw leaving a glowing red disc on the Sagitarii's foreheads. They are now the Red Shard, the soldiers of Brainiac and appear with him when he makes his appearance at the rituals for Rao.