"Elementary" The Hound of the Cancer Cells (TV Episode 2014) - IMDb

: Sherlock Holmes and Joan Watson investigate the murder of a prominent cancer researcher who was killed by a helium overdose . The investigation focuses on whether the death was linked to the scientist's latest cutting-edge medical invention.

: Bob Goodman, Jeffrey Paul King, and Brian Rodenbeck. Sherlock Holmes : Jonny Lee Miller Joan Watson : Lucy Liu Detective Marcus Bell : Jon Michael Hill