Cho-Je

Cho-Je was the assistant of K'anpo Rimpoche while he lived as a Buddhist abbot on late 20th century Earth. In reality, he was a projection of K'anpo's future incarnation.

Biography
When K'anpo was struck down by the Eight Legs possessing his own meditation students as human hosts, Cho-Je faded into nothingness and then reappeared, taking K'anpo's place. He had regenerated. He corrected Tommy when he addressed him as "Cho-Je", maintaining that he was K'anpo (TV: Planet of the Spiders) – "or, if you prefer, I am both!" (PROSE: Doctor Who and the Planet of the Spiders)

Behind the scenes

 * Cho-Je appeared before the mechanics of regeneration were well-established, and his denial of the name "Cho-Je" after merging with K'anpo resembles the Second Doctor's past-tense commentary on "the Doctor" immediately after his own regeneration in The Power of the Daleks.
 * Over a decade later, the Watcher played a similar role in Logopolis, merging with the Fourth Doctor at the moment of his regeneration.