In 2155, he was stationed aboard the ISS Enterprise. In January of that year, he accompanied the captain's woman Lieutenant Hoshi Sato to arrest Lieutenant CommanderT'Pol and they found her in a corridor. When Sato tried to kill T'Pol, the Vulcan officer knocked Kelly unconscious and fought with Sato. After T'Pol knocked Sato to the deck, Kelly fired on T'Pol as she tried to escape, stunning her with his particle rifle. Kelly was then instructed by Sato to bring the unconscious T'Pol with them. (ENT episode: "In a Mirror, Darkly")