- You may be looking for Hester from Outbreak or Hester Stanton.
Hester was a Gallifreyan technician. An alternative Leela asked him to find a human colony called Mordy, time-lock it, and delete all information in the Matrix about it. (AUDIO: Reborn) He then informed Romana II about the temporal correction of Mandatorium VI with coordinator Vansell. (AUDIO: Disassembled)