Is the Doctor's humanoid appearance a mere appearance? On TV, he once said that the TARDIS's appearance was here but that its real being was outside time. Another character commented, "Ah, you are a true philosopher!"
On its original publication in Tales Of The Knights Templar (New York, 1995), edited by Katherine Kurtz, the last Time Patrol story, "Death And The Knight," was doubly introduced by editor and author. Kurtz wrote that, if time is fluid and mutable, then we must hope that there are or will be Time Lords to perform policing tasks:
"...to make certain that crucial aspects of our past are not changed, so that all our yesterdays will unfold into our desired tomorrows...
"Poul Anderson writes of the Time Lords thus:..." (p. 273)
Anderson does not use the term "Time Lords" but, in this passage, he does not name the Danellians either. He writes of "...the superhumans who dwell in the ages beyond..." (p. 274)
There is much scope here for creative sequels.
The Bird of Time has but a little way
To fly — and Lo! the Bird is on the Wing.
-copied from here.