How the Grinch Stole Christmas! (TV special) Seuss cartoon, "Horton Hears a Who"). Both story collections contain selected dialogue and music numbers. The "isolated music tracks" in this edition are taken directly from the television soundtrack and are not the re-recorded tracks from earlier versions. The dialogues are the originals, being voiced by Boris Karloff for "Grinch" and Hans Conried for "Horton." Because Thurl Ravenscroft was not credited in the closing credits of the 1966 television special as singing the song "You're a Mean One, Mr. Grinch", it is sometimes attributed to Boris Karloff. After becoming aware of this oversight, Seuss himself called Ravenscroft and apologized profusely
How the Grinch Stole Christmas! (TV special) and later wrote letters to columnists nationwide telling them that it was Ravenscroft who provided vocals for the musical number. Karloff received a Grammy Award in the Spoken Word category—the only major performing award of his career—for the album. A television special called "Halloween Is Grinch Night", created by DePatie-Freleng Enterprises, aired on ABC in 1977, eleven years after the Christmas special. This special involved a tale of the Grinch coming down to scare the Whos every Halloween. Though less successful than the original, it was awarded an Emmy. A later cartoon, "The Grinch Grinches the Cat in the Hat"