As a founding member of the Justice League, the character joins the team's mission to thwart the Joker in Japan, where he attempts to steal secret weapons and cause chaos. Anomalies in Batman's behavior during this operation prompt an investigation. She confronts the Joker and adversaries including Harley Quinn and the Penguin in combat, utilizing superhuman physical abilities alongside signature equipment: the Lasso of Truth, indestructible bracelets, and a projectile tiara. She operates with fellow League members Superman, Batman, the Flash, Cyborg, and Aquaman, and collaborates with the Eagle Talon Society to resolve the conflict involving Batman's compromised state and the Joker's schemes.