Charlie Chan (Sidney Toler) lumbers through another mysterious mystery in Monogram's The Shanghai Cobra. The plot this time concerns the US government's efforts to protect a cache of valuable radium. Someone who wants to get his (or her)hands on the valuable mineral has been killing a number of people, apparently using a deadly cobra as the murder weapon. Despite the intrusive "assistance" of his son Tommy (Benson Fong) and his nervous chauffeur Birmingham (Mantan Moreland), Charlie Chan solves the case. 70-year-old Sidney Toler was obviously tiring of the Charlie Chan role; in some scenes, it looks as though his costars are feeding him his lines!