Between January and June 1993, GeoSystems-an R.R. Donnelley and Sons Company-compiled and produced thirty animated maps for the 1994 edition of the New Grolier Multimedia Encyclopedia. Animated subjects requested by Grolier included the American Revolutionary War, World War II, and Magellan's circumnavigation of the world. I collaborated with GeoSystems as a private consultant, providing design specifications for the series. In this paper, I discuss some of the cartographic challenges GeoSystems faced in condensing these complex events into brief (4-5 minute) animations.