Handrel

Handrel was a Time Lord who gathered a band of followers to try and solve the problem of limited regeneration.

Biography
Handrel and his followers used a Time scoop to capture ancient monsters from around the universe to combine their DNA with that of a Time Lord. Handrel was stopped by the Doctor, who called in backup from President Romana. Handrel and his followers were killed in the resulting fight with the Chancellery Guard. (ST: The Time Lord's Story)