The 27-year-old actress and musician reflected on the classic 2000 film in a rare interview.
'Dr. Seuss' The Grinch Musical' premiered Wednesday night on NBC to mixed reviews.
ET's mini correspondents spoke with Cumberbatch ahead of his upcoming movie, 'The Grinch,' in theaters Nov. 9.
This animated spin on the Christmas classic comes to theaters on Nov. 9, 2018.