The Filthy Critic wrote:

Willis slowly accepts that he's a superhero--invincible, powerful and clairvoyant--and he is unhappy because he hasn't been solving superhero crimes. In the last half-hour of Unbreakable, he solves one crime, then learns who his arch-enemy is. Now, I won't tell you who it is because that's supposed to be a BIG secret. But, let's just say that it's a character I've mentioned, and that character dresses like a super-villain, has a super-villain nickname and super-villain hair.

Oh, my God, you'll never guess because it's such a big fucking surprise. You'll even be shocked when the villain has to yell "I'm your arch-enemy!" just in case you couldn't figure it out.