10 Doctor Who Episodes With Disturbing Implications
3. All Humans Are Murderers (Day Of The Moon)
Even though the Doctor could probably beat most villains while blindfolded, Day Of The Moon saw the Eleventh Doctor enlist the help of the entire human race in order to fight back against an alien force known as the Silence.
And his plan... well, it isn't exactly a peaceful one, to put it mildly.
Instead, it's incredibly, incredibly violent. The Doctor manipulates the 1969 moon landing video so that it turns anyone watching it into a killer, getting them to murder the Silence on sight, with no mercy, and no questions asked.
Even worse, these humans don't even know that they're murderers. The Silence can only be remembered while they're being observed, which means that you could see one, bash its skull in, turn away... and just carry on with your day.
It's quite an unsettling thought, but allow us to make it even more unsettling: given that most humans will watch the moon landing video at some point in their lives - and considering that there are pockets of Silence all over the Earth - a significant portion of the human race are probably murderers. Yeesh.