Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best
70. The Vardy
Appear in: Smile.
Say "cheese", otherwise you'll end up getting disintegrated by the Vardy, a microbotic swarm that monitored people's happiness via mood badges provided by the Emojibots.
It's the classic human-robot sci-fi tale where the AI goes horribly wrong - when one of the first human colonists died, the Vardy/Emojibots hadn't experienced grief before and consequently identified this emotion as an enemy of happiness. So combined with their well-intentioned purpose to eliminate all unhappiness, anyone else seen to be upset or crying would be killed. That side of things gets two thumbs down, but huge heart emojis for creating some truly stunning off-world architecture.