Incidentally, does your copy have the original unbroadcast pilot version of the first episode? It's more-or-less the same script-wise but the Doctor is even more bad-tempered and unlikeable than in the broadcast version. Apparently one of the reasons it was re-shot was because they decided that the character needed softening - and, after watching it back, even William Hartnell himself agreed with this and was keen to give it another try.
Also, Susan is pretty weird and scary in the pilot.