Helga Jace

Dr. Helga Jace is a fictional character in the DC Comics Universe. She is a supporting character of the Outsiders and was the scientist responsible for bestowing the different earth-controlling powers upon Princess Tara/Terra and her elder brother Prince Brion/Geo-Force. 
The character was portrayed by Jennifer Riker in the live-action Arrowverse television series "Black Lightning" in the second and third seasons.
Publication history.
Created by Mike W. Barr and Jim Aparo, Helga Jace first appeared in "Batman and the Outsiders" #1 (1983). She was apparent supporting of the Outsiders.
In the "Millennium" storyline 1988, revealed Helga Jace to be a villain and agenda, written by Steve Englehart.
Fictional character biography.
Dr. Helga Jace was a scientist and geneticist from Markovia who worked directly for the Royal Family. After the death of King Viktor, a revolutionary movement broke out. She used her scientific ability to activate Prince Brion Markov and Princess Terra's Meta-genes to give them powers.
After the process was complete she was kidnapped by invading forces. The forces was led by Baron Bedlam. She was later rescued by Metamorpho of the Outsiders, who hoped she could help with his cure. Dr. Jace agreed after learning Brion was not dead.
She also helped Rex Metamorpho reunite with his lost love Sapphire Stagg. However, her father Simon Stagg attacked and killed Metamorpho.
She traveled to Egypt with the Outsiders where revived Metamorpho with the meteor which first transformed him. The second exposure left Rex permanently transformed into Metamorpho and Dr. Jace no longer has the means to cure him.
Dr. Jace later helped Halo recover her lost memory using equipment from the destroyed Justice League Satellite.
During the "Millennium" storyline, it was revealed that Dr. Jace was working for the Manhunters. Using a psychic chip in Metamorpho's brain, Dr. Jace took control of him and had him attack the Outsiders. The Outsiders woke up strapped to tables in a laboratory run by Dr. Jace. After escaping from the laboratory, Looker tricked Metamorpho into attacking Dr. Jace. When Dr. Jace used a weapon on Metamorpho, it caused a surge that killed Dr. Jace and Metamorpho.
In the rebooted "DC Rebirth", Helga Jace is an astrophysicist from Markovia who is working for the Kobra organization under duress. Katana came to Markovia rescue her from Lady Eve. King Kobra interrogates Dr. Jace as Katana plans to rescue her. King Kobra later shows Dr. Jace the powers of the comatose girl that she was watching. King Kobra reveals that he caught an Aurakle as he plans to weaponize it. Before returning to the ship's command center, King Kobra leaves this task to Dr. Jace. During the Suicide Squad's fight with King Kobra's forces, Katana and Enchantress find that King Kobra had Dr. Jace fuse Violet Harper with the Aurakle as King Kobra activates the implant in Violet's neck only for Violet to tear it out as the Aurakle gains control of Violet's body. As King Kobra, Katana, and Enchantress fight Violet who is now a vessel for the Aurakles under the name of Halo, Dr. Jace flees from the battle and runs into Harley Quinn and the other Suicide Squad members as they head into the direction of the engine room. When on the ground, Dr. Jace and Prince Brion Markov witness Katana escaping with Halo.
In the "Watchmen" sequel "Doomsday Clock", Helga Jace is among the people that reveal the Superman Theory.