An unpredictable black comedy with an epic scope, "Underground" takes a look at the modern history of Yugoslavia through the often absurd misadventures of two friends over several decades. The film begins in Belgrade in 1941, establishing the friendship between the gregarious Blacky and the more intellectual Marko during a drunken, late-night musical procession that establishes the riotous tone to follow. Fellow members of the Communist Party, the friends also share an involvement in shady business activities and an attraction for a beautiful actress. Soon, the chaos of World War II forces them to take refuge in an underground shelter with a variety of other townspeople. Years pass and the war ends, but Marko and the actress trick the others into believing that the war is still going on.