Benedict Cumberbatch

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This image released by PBS shows "Sesame Street" character Murray Monster, left, and actor Benedict Cumberbatch during the taping of a video posted Tuesday, Feb. 4, 2014, on PBS' YouTube channel. (AP Photo/PBS)

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This image released by PBS shows "Sesame Street" characters Murray Monster, left, and Count von Count, right, with actor Benedict Cumberbatch during the taping of a video for posted Tuesday, Feb. 4, 2014, on PBS' YouTube channel. With the help of Count and Murray, Cumberbatch explains how to count up four apples and three oranges, and which is the greater number. (AP Photo/PBS)

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This image released by Sesame Workshop shows Murray Monster, left, and actor Benedict Cumberbatch during the taping of a video for "Sesame Street," posted Tuesday, Feb. 4, 2014, on PBS' YouTube channel. (AP Photo/Sesame Workshop)

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This image released by Sesame Workshop shows characters Murray Monster, left, and Count von Count, right, with actor Benedict Cumberbatch during the taping of a video for "Sesame Street," posted Tuesday, Feb. 4, 2014, on PBS' YouTube channel. With the help of Count and Murray, Cumberbatch explains how to count up four apples and three oranges, and which is the greater number. (AP Photo/Sesame Workshop)