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) songs and animated sequences without words (the longest being an extended scene in which the Grinch and Max comically descend into Whoville) were added. As all the major networks had flipped to full color schedules by 1966, the special was likewise produced in color, establishing the Grinch's color (white in the two-tone illustrations of the original book) as green, a convention used in later television specials featuring the character as well as the 2000 and 2018 film adaptations. The half-hour (with commercials) short was originally telecast in the United States on CBS on December 18, 1966. CBS repeated it annually