Helga Jace

The Markovian scientist who gave Geo-Force and Terra their powers, a Light agent in the show.

Helga Jace is a DC Comics character, a scientist and supporting figure of the Outsiders who gave Princess Tara Markov and her brother Prince Brion their earth-controlling powers. Created by Mike W. Barr and Jim Aparo, she first appeared in Batman and the Outsiders #1 in 1983.

In Young Justice she is voiced by Grey DeLisle, and Jennifer Riker played her in the live-action Black Lightning.

Quick Facts

Publisher: DC Comics
Debut: Batman and the Outsiders #1 (August 1983)
Creators: Mike W. Barr; Jim Aparo
Alliances: Outsiders; Markovian royal family
Powers: Genius-level intellect

Facts from the source article.

Background

In the comics Jace is a geneticist from Markovia working for the royal family. After King Viktor's death she activates Brion's and Tara's metagenes, is kidnapped by Baron Bedlam's forces and rescued by Metamorpho, whom she hopes to cure. In the Millennium storyline she turns out to be working for the Manhunters and dies when her own weapon surges.

In the DC Rebirth relaunch she is an astrophysicist forced to work for Kobra, who has her fuse Violet Harper with an Aurakle to create Halo.

The Young Justice version is a protégé of the Ultra-Humanite and a member of the Light who serves as the Markovian royal physician. Working with Baron Bedlam's metahuman trafficking ring, she turns Tara and Brion into metahumans and kills Gabrielle Daou, later resurrected as Violet Harper, then uses her bond with Brion to infiltrate Nightwing's team and becomes his advisor when he overthrows his brother Gregor.