Thor Girl is one of the heroes who registers with the Superhuman Registration Act that was forged during the 2006-2007 "Civil War" storyline. After the Superhuman Registration Act is passed, Thor Girl interferes in a jewel theft undertaken by the Grey Gargoyle, a previous foe of hers, and dispatches him, preventing the jewel heist in the process. In return, the Grey Gargoyle undertakes a lawsuit with the assistance of Mallory Book at the Superhuman Law Offices of Goodman, Lieber, Kurtzberg & Holliway.