Lethe

Lethe was committed to the Tantalus Penal Colony during the mid-23rd century. By 2266, she had been rehabilitated and had elected to stay on as a therapist on Dr. Tristan Adams' staff.

Questioned about her offense by Captain Kirk, she replied "Does it matter?" She described her previous self as a "different person – malignant, hateful." Dr. Helen Noel remarked that the shifting of memory patterns was basic to psychotherapy; Dr. Adams added that patients should not be required to relive the evils committed earlier in their lives, when they were ill. 

Lethe