Kelly was a MACO assigned to the ISS Enterprise in 2155. He accompanied Hoshi Sato to arrest T'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: "In a Mirror, Darkly, Part II")