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OTRC: Benedict Cumberbatch appears in 'Sesame Street' video - watch

'Sherlock' star Benedict Cumberbatch appears in a 'Sesame Street' video posted on PBS's YouTube page on Feb. 4, 2014. (youtube.com/user/PBS)

Benedict Cumberbatch takes on a Muppet version of his "Sherlock" character's arch nemesis in a new "Sesame Street" video.

The clip, titled "Benedict Cumberbatch and the Sign of Four (or is it Three?)," was posted on PBS' YouTube page on Tuesday, Feb. 4. The season 3 finale of "Sherlock," a popular BBC-produced mystery-comedy series, aired on the U.S. network two days earlier.

In the video, the 37-year-old popular actor, also known for his role as the villain Khan in the 2013 film "Star Trek Into Darkness" and as the voice of Smaug the dragon in "," encounters Murray-arty, a play on the name of Sherlock Holmes' adversary Moriarty.

"Did you miss me? Did you miss me? Did you miss me?" the Muppet says (in what "Sherlock" viewers will recognize as a season 3 spoiler.)

"I'm not really Sherlock," Cumberbatch later tries to explain. "I just play him on the television."

"Well, what's your name, then," Murray-arty, aka Murray Monster, asks.

"Benedict," the actor replies.

"Well then, are you ready for my brain-bending challenge, Benedict Sherlock?"

The Muppet then presents Cumberbatch with four green apples and three oranges and asks him whether there is a larger number of the former fruit or the latter. Enter Count Von Count, of course.

The clip was taped in January. Cumberbatch talked about it at the Television Critics Association's "Sherlock" event in Pasadena, California, according to the Associated Press.

"I just met with the Muppets," he told actress Amanda Abbington, the real and TV wife of "Sherlock" actor Martin Freeman, who plays Holmes' partner and friend, Dr. John Watson.

"Did you have a good time?" the AP quoted her as saying, to which he replied: ""It was so much fun. They are real."

Watch Benedict Cumberbatch's "Sesame Street" video below.

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