During Krypton's last days, General Zod lost faith in the Council and their decision making. Jor-El had an audience with the Council telling them that Krypton would implode in a matter of days. Lor-Em and High Eminence Ro-Zar, however, inform him that evacuation is inconsiderable.
The audience is suddenly interrupted by General Zod and his radical Sword of Rao loyalists, who shoot their way into the chamber, with Zod personally killing High Eminence Ro-Zar, while Lor-Em and the other councilmen were forced from their thrones by Faora.
However, after the Sapphire Guards undermine the coup and capture General Zod and his loyalists, they also free Lor-Em and the councilmen. The council then promptly re-assembles, with Lor-Em now replacing Ro-Zar's position as High Eminence. He proceeds to put the Sword of Rao on trial, sentencing them to 300 years of somatic reconditioning within the Phantom Zone, much to General Zod's dismay. Lor-Em and the rest of the council then proceed to watch as the war criminals are encased in cryocapsules, loaded onto the Black Zero starship, and put through the Phantom Zone Projector.
Genetically engineered to be a skilled leader (ultimately becoming the High Eminence of the Kryptonian Law Council), Lor-Em was fiercely loyal to Krypton's ideals, much to the chagrin of Jor-El and General Zod, with the former seeing Lor-Em's ideals as stale, flawed, and outdated, and the latter seeing Lor-Em representing a "degenerative bloodline" that lead their native planet to ruin.
Lor-Em was also quite dogmatic, refusing to take Jor-El's warning of Krypton's imminent destruction seriously, and thus also refusing to assemble an evacuation, which was ultimately his undoing, causing him to perish with his native planet.
- Expert Leader: Lor-Em, due to his genetic engineering, was an extremely capable leader, sitting on the Kryptonian Law Council as its spokesperson, and later replacing Ro-Zar as High Eminence of the council, after her sudden death at the hands of General Zod.