The doctor on Camus II who helps Janice Lester take over Kirk's body in Turnabout Intruder.
Dr. Arthur Coleman is a physician with the expedition on Camus II. In Turnabout Intruder, he is the accomplice of Janice Lester, Kirk's former lover, in her plan to switch bodies with Kirk using an ancient device found on the planet. Coleman is in love with her.
With Lester in Kirk's body, Coleman tries to take McCoy's place as the ship's doctor and plots to kill Kirk, who is trapped in Lester's body. When the transfer fails, Coleman asks to care for Lester. He was played by Harry Landers.