Benedict Cumberbatch Benedict Cumberbatch

 star Benedict Cumberbatch stopped by Sesame Street recently, but had a tough time convincing Murray Monster (a.k.a. "Murray-arty") that he's not actually a detective — he just plays one on TV.

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Cumberbatch was nonetheless given a mystery to solve by Murray Monster and The Count. The puzzle? To figure out whether there are more apples or oranges on the table in front of him.

Watch Cumberbatch gamely work out the clues in this video, which was posted on PBS'YouTube page on Tuesday: