Senior Starfleet officer who, on Stardate 50893 (2373), mobilized a fleet of starships in the Typhon sector to engage a Borg cube on a direct course for Earth. Due to Captain Picard's previous experience with the Borg, and viewing it as a liability, Admiral Hayes ordered the Enterprise-E away from the battle. During the armada's attack, however, the Admiral's flagship was destroyed, but Hayes survived.

Around Stardate 51501 (2374), Hayes sent an encrypted message, via a Hirogen relay station, to the U.S.S. Voyager, while the ship was still stranded in the Delta Quadrant. In the message, Hayes expressed Starfleet's appologies for being unable to expediate the ship's journey home. Hayes' message also included data that Starfleet collected regarding the Delta Quadrant, as well as several personal letters for the Voyager crew.