Spell Binder, the nemesis of the title character from The Adventures of Letterman, an animated segment from the children's television series The Electric Company
Gene Wilder—Letterman (most of the time—some early episodes use a different voice actor)
Late Show with David Letterman | Alice's Adventures in Wonderland | The Adventures of Tintin | David Letterman | Late Night with David Letterman | Adventures of Superman | Lois & Clark: The New Adventures of Superman | Adventures of Superman (TV series) | Adventures of Huckleberry Finn | Virgin New Adventures | The Adventures of Priscilla, Queen of the Desert | Tiny Toon Adventures | Ghost Adventures | Virgin Missing Adventures | The Adventures of Tom Sawyer | Alice (Alice's Adventures in Wonderland) | The Adventures of Tintin (TV series) | The Adventures of Sherlock Holmes | Eighth Doctor Adventures | The Sarah Jane Adventures | The Country Mouse and the City Mouse Adventures | The New Adventures of Old Christine | The Adventures of Pete & Pete | Dormouse (Alice's Adventures in Wonderland) | The Adventures of Jim Bowie | The Adventures of Ford Fairlane | The Adventures of Brisco County, Jr. | Adventures of the Little Koala | Top Trumps Adventures | The New Adventures of the Elusive Avengers |