Watcher (Logopolis)

Prior to regeneration, Time Lords were sometimes visited and observed by a being known as a Watcher (TV: Logopolis, et al.) Observer, or shayde. (PROSE: Divided Loyalties) Sometimes merging with the Time Lord during regeneration, (TV: Logopolis, AUDIO: Winter) Watchers were the unregenerate forms of future incarnations (AUDIO: Trial of the Valeyard) or projections of alternative versions of the Time Lord. (PROSE: Divided Loyalties) A normal Watcher existed in a protoplasmic pupate state, (AUDIO: He Jests at Scars...) having "no real substance" but "an essence of what was and what will be". (PROSE: Divided Loyalties)

The Fourth Doctor witnessed his own Watcher before regenerating into the Fifth Doctor. (TV: Logopolis, PROSE: Into the Silent Land) While the Sixth Doctor claimed to have only seen a Watcher once, (AUDIO: Trial of the Valeyard) the Doctor later encountered Watchers during their regeneration into the Sixth Doctor (AUDIO: Winter) and in their tenth incarnation. (PROSE: The Advent of Fear)

The Sixth Doctor once speculated that the Valeyard was a Watcher, but Darkel shot down the idea on the basis that the Valeyard looked nothing like a Watcher. (AUDIO: Trial of the Valeyard) In another universe, Vansell and a Time Lord President were certain that The Valeyard was the first known Watcher to be thinking, self-aware, and independent. (AUDIO: He Jests at Scars...)

Rallon had a Watcher. (PROSE: Divided Loyalties)

Immediately before her regeneration, Mullion saw her own Watcher on the other side of a lake. Convinced that it was actually her future self come to paradoxically kill her as she had killed her past selves, Mullion was distracted trying to kill the Watcher when she was murdered by Hole. (PROSE: What Keeps Their Lines Alive)