Mercy, the Mummy Mumbled pokes fun at both mad scientists and the Egyptian mummy craze that followed the discovery of King Tut's tomb early in the 20th century. A young man wooing the daughter of a scientist hatches a get rich quick scheme when he spots a classified ad searching for "a mummy for experimental purposes." While he wraps up a phony for the scientist, two Egyptian agents (outfitted in a crazy mix of ancient fashion and modern style) tracking stolen relics get tangled in the confusion.