Thomas was a Starfury pilot assigned to Babylon 5's Delta Squadron, flying under the callsign "Delta 9." Thomas was known to sometimes display a disdain for authority, and he cared little for ranks. All he wanted was to get to the controls of his Starfury. In 2261, Thomas was with Commander Susan Ivanova's Starfury Squadron when they discovered the Thirdspace artifact in hyperspace, while returning to the station following a successful ambush of raider forces. When the artifact turned out to be a jumpgate to another universe inhabited by hostile species, Thomas and the rest of Delta Squadron tried to destroy it, but were killed by the Thirdspace Aliens.