Donald Kerr (1891-1977) was a character actor who played "Happy" Hapgood in the 1940 movie serial, Flash Gordon's Trip to Mars. Kerr appeared in more than four hundred serials, films, and TV shows between the 1930s and the 1960s, following several years in Broadway revues, including The Passing Show of 1917 and The Greenwich Village Follies of 1921. Though most of his work was uncredited, he worked steadily, often as drunks, though his main specialty was the nosy reporter in mystery or horror films, of which Happy Hapgood remains his pinnacle. Other credits in that mold include the Ellery Queen entry The Spanish Cape Mystery (1935, as Hendricks), the 1937 Dick Tracy serial, and more high-profile features such as Angels with Dirty Faces and Mr. Smith Goes to Washington (as one of the report