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Ultimate Jaburg53 said:
His real name (perhaps) came up in "The Horns Of Nimron". The Doctor runs into a timelord in the undergrond cavens who calls him by a diffrent name.



Oh, this old chestnut, eh? You're talking about the infamous "Theta Sigma" line, right? Per everything I've ever read, heard, or tweaked about that, the original script made it plainly obvious that this was a "university nickname", as they were school friends. However, I believe the inference to it being just a nickname was either cut, or not made obvious enough. This is one of those bits of lore that always leaves fandom in an uproar (i.e. the extra faces seen when The Doctor and Morbius are battling out their regenerations in The Brain of Morbius)...