Vice Admiral Marcus Graves of the IMC is voiced by Nathan Constance.
In the IMC command structure, Vice Admiral Graves is formally known as the CINCFRONT, or Commander-in-Chief, Frontier Command. Despite the elaborate title, Frontier operations are notorious for their lack of adherence to traditional protocol, allowing Graves to personally command IMC forces in the field, and to operate far more informally than commanders in the Core Systems. Graves has a reputation as a maverick within the IMC. His calls for policy change have often been deemed too risky to IMC forces, and too lenient to Frontier citizens. During the inquiry into the Odyssey scandal, Graves maintained that the ship was forcibly commandeered by MacAllan and his band of mutineers.