Elementary 2x18 "The Hound of the Cancer Cells" and 2x19 Spoilers
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For those of you lamenting the loss of Raising Hope, I have some good news! Garret Gillahunt has been tapped to guest-star in an April episode as Bart Macintosh, the owner of a dairy farm in upstate New York whose brother is suspected of engineering a plot to release anthrax in New York City. Bart will become an integral part of Sherlock and Joan's efforts to catch the supposed criminal.
Source, Promo