T'Mret was a doctor on Starbase 24. T'Mret repaired the six-year old Worf's brain damage following the Romulan sneak attack on the Klingon colony of Khitomer in 2346. Although he couldn't prevent some memory loss from occuring, T'Mret saw no reason why Worf couldn't live a normal, healthy life. (TLE novel: The Art of the Impossible)