In the mirror universe, Dr. Tristan Adams was a Terran doctor who was the head of the Terran Empire's Tantalus colony in 2264. Although official propaganda indicated that the colony was for insane individuals, Tantalus was really a prison for those who had fallen out of favor or refused the will of the Empire. Those individuals sent to Tantalus were ones whose family had some limited influence within the bureaucracy of the Empire and yet could not be killed outright. Upon arriving at the planet, inmates had their belongings confiscated and were subjected to torture as well as the neural neutralizer. However, Adams began to use the neutralizer to genuinely rehabilitate prisoners, which earned him the ire of Starfleet Command.