Ledroptha Curtain, known as L. D. Curtain in the TV series, is the main antagonist of The Mysterious Benedict Society. He is the twin brother of Mr. Benedict and like his brother, suffers from narcolepsy. He is the founder and headmaster of the Learning Institute for the Very Enlightened. His narcolepsy is triggered when he gets angry. He regularly travels in a highly-powered, "souped-up" wheelchair. He is, in fact, quite physically strong and uses the wheelchair mainly to disguise the fact that he has narcolepsy due to anger, as a fit of sleeping will generally cause him to collapse if he is standing. Unlike Mr. Benedict, Mr. Curtain's narcolepsy is not triggered by laughter.