i've often wondered this and thought i'd finally bring it out for everyone to answer...
it's not an easy question to answer as it had many possible answers but none of them fit completely...
The Doctor has always travveled with a companion, Human, Alien, Time Lord, Robotic or otherwise... but the main question is why...
why does he need someone?
you'll note that he is very rarely, if ever, alone...
he's stated several times that he needs someone... but needs them for what?
Martha said it was because he was lonely... that i can understand, he's over 900 years old and watched his family, his friends, his entire planet turn to dust and crumble in the time war...
Donna said it was to hold him back... again, that i can understand... when he didn't have a companion he is very deadly and has exterminated several alien species completely if noone is there to help him with the better angels of his nature...
Jack said it was to show someone else the universe through his eyes... that i can sort of understand... He's seen so much, done so much... to see it all through fresh eyes would be a pleasure after seeing the entirity of time and space...
Rose never answered the question... but several other companions have, always giving different answers...
M
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