From the front cover:
The Joker
For 6-8 Characters Generated Using 500-1000 Hero Points
From the back cover:
Beware! Your Wildest Dreams May Come True!
The Teen Titans Don't Stand a Chance!
Deep in Arkham Asylum, a wild-eyed man claws at the walls. He gibbers and shouts about a mysterious dwarf with the power to make dreams come true. THE DOCTORS DO NOT LISTEN!
He was just another wandering madman sent here from New York City. THE POLICE DO NOT LISTEN!
They are too busy to investigate the babblings of a madman. Friends, family, no one listens. No sane person dares to listen. No sane person at all. But the inmates in Arkham are not sane. Some of them are dangerous. The most dangerous of them is the Joker. He believes. He listens. He plans...