Blacky's best friend and fellow communist activist. Sets up a weapons stash, hides Vera and Ivan in his grandfather's cellar during the war, and later strangles the German officer Franz. In the Cold War era, he becomes Tito's close advisor, orchestrates a decades-long deception to keep Blacky hidden underground, and attempts to broker an arms deal in 1992 before being beaten by Ivan.
Marko provides Vera with shelter and protection during occupation.
Marko takes Vera, the protagonist's pregnant wife, and others into his grandfather's cellar to hide during German raids.
Their opposition culminates in Franz's killing.
Marko enters the hospital through an underground sewer passage and strangles Franz to death with a cord.
Their wartime connection develops into a long-term romantic partnership.
The plot states that Marko and Natalija are a couple after the Easter 1944 events.
Explore the full interactive character relationship map of Underground