10 Most Terrifying Villains In Non-Horror Movies

During the events of The Prisoner of Azkaban, Harry Potter had already rescued his friends countless times, destroyed the wicked Basilisk, and defeated Voldemort twice. Since the Dark Lord took a break from pestering Harry this time around, our bespectacled hero should have it easy this year.

Instead, Harry encounters a force that's arguably more chilling than Voldemort. 

Before arriving in Hogwarts, Harry learns there's a manhunt for an escaped prisoner called Sirius Black. Hoping to find Sirius, the area is patrolled by gliding wraiths called Dementors.

Although the Dementors have a suitably eerie look, it's their behaviour that earns them a place on this list. Rather than attacking their victims directly, the 12-foot-tall phantoms feed on human happiness, paralysing anybody in their proximity with an overwhelming sense of depression. 

This feeling can be so overbearing, it causes most people to faint after a few seconds - which Harry proves upon his first encounter with the cloaked creatures - and if a Dementor gorges on their prey's emotions for too long, they'll be reduced to a vegetative state, unable to feel happiness ever again.

After spending a moment with these heinous entities, Voldemort doesn't sound too bad.