Second Time Lord (Colony in Space)

An incarnation of Adelphi was Second Time Lord when the Doomsday Weapon was lost.

Biography
When a report on the Doomsday Weapon went missing from the Time Lords' files, the Second Time Lord, (PROSE: Doctor Who and the Doomsday Weapon) again having regenerated into another incarnation, was one of those convinced had taken it while making a report to Pandad IV. Together, they, along with a third Time Lord, sent the Doctor and Jo Grant to the planet Uxarieus in the year 2472 to investigate. The Second Time Lord expressed doubt over whether or not the Doctor would help, and he pointed out the Doctor had good reason to resent them since they had taken away his freedom, though he silently accepted that his freedom would be temporarily restored to investigate what the Master was doing. (TV: Colony in Space)