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
The Grimm Who Stole Christmas percent of all households watching television at that time watched it. With DVR factoring in, the episode was watched by 7.56 million viewers and had a 2.2 ratings share in the 18-49 demographics. "The Grimm Who Stole Christmas" received positive reviews. Kathleen Wiedel from "TV Fanatic", gave a 4 star rating out of 5, stating: "'Tis the season for holiday-themed episodes, and "Grimm" is no exception. This time, Nick and friends were faced with a trio of destructive Christmas gremlins! Though silly and mostly light-hearted, "Grimm" Season 4 Episode 7 had some great moments, too." MaryAnn Sleasman from "TV.com", wrote,