Stone serves as a police sergeant in Arkham City during the conflict between the Hadou Financial Group and the Black Lodge syndicate. As part of the Arkham City Police Department, he collaborates with the vigilante Metatron to safeguard civilians from supernatural threats, especially during assaults by Black Lodge forces. Lacking magical abilities or enhancements, Stone nevertheless proves reliable and competent in crisis situations, coordinating evacuations and maintaining order amidst chaos. His pragmatic handling of eldritch phenomena underscores his role as an ordinary human navigating extraordinary dangers.

Stone works with his partner, Ness, within the police force's response to the city's escalating occult conflicts. He embodies the conventional law enforcement perspective, offering ground-level support during incidents like monster attacks and mecha battles. His actions directly contribute to protecting civilians during events orchestrated by antagonists such as Doctor West and the Anticross.