T. Virts was an Earth Starfleet ensign who served as an engineer aboard Enterprise in 2161.
He was on duty in main engineering and worked with Lieutenant M. Fincke on freeing the deuterium filters, while Enterprise was on a rescue mission for Commander Shran's daughter Talla. (ENT: "These Are the Voyages...")
T. Virts was played by real life NASA astronaut Terry Virts, who received no credit for his cameo appearance.