Anyone who has ever watched Doctor Who knows that the Daleks are probably his biggest (and most dangerous) enemy. Both have a deep hate for each other, and yet, never kill their nemesis. Obviously, the Doctor doesn't kill, but what's stopping the Daleks from killing him? Throughout the entire run of Doctor Who, they have had countless opportunities to kill him, and yet they never do. It has been one of the biggest mysteries of the show for me.... until now.
As shown in "The Witch's Familiar", the second episode in the latest season of the show, the Doctor goes back in time to the day where Davros was captured in a field of Handmines, and saves him despite having full knowledge that the boy will grow up to be one of his worst enemies. This allowed Davros to create the Daleks in the future.
Now, in the same episode, we learn that the Daleks have a genetic defect - a respect for their father, which Davros was not able to erase. Due to the events that led to their creation, it can be seen that indirectly, it was the Doctor who created the Daleks. Therefore, indirectly, HE was the "father" of the Daleks, which means that they respect him.
I know it sounds crazy, right?
Although Davros has programmed them to obey him, deep inside their subconscious, they know that it's because of the Doctor that they exist, and so cannot hurt him - as much as they would like to.
What's even more interesting is that the Doctor cannot go back in time to undo his actions. If he does that, and lets Davros die, then the Daleks will never have been created in the first place, which means that he wouldn't have had any reason to go back in time. But wait... if he DIDN'T go back in time to kill Davros, that means he's still alive, and can create Daleks in the future.
This scenario is another classic example of a time paradox in Doctor Who, known as the Grandfather Paradox, which can be explained by the following situation:
A time traveller goes back in time and kills his grandfather before his grandfather meets his grandmother. As a result, the time traveller is never born. But, if he was never born, then he is unable to travel through time and kill his grandfather, which means the traveller would then be born after all, and so on.
Pretty mind-blowingly awesome, right? If you are curious, check out the latest season of Doctor Who!
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