Illumination originally wanted Cumberbatch to voice the Grinch in his natural accent, however, Cumberbatch felt that since the rest of the cast is American, the Grinch himself should have an American accent.
Penerangan awalnya ingin Cumberbatch untuk menyuarakan Grinch dalam aksen alami, namun, Cumberbatch merasa bahwa karena para pemain lainnya adalah Amerika, Grinch sendiri harus memiliki aksen Amerika.