Zenia Marchenko was a Russian astronaut who served aboard Cosmonaut Alexei Leonov. She was the youngest member of the crew.

2010: Odyssey TwoEdit

In the novel, Zenia Marchenko is not introduced until after Heywood Floyd awakes from hibernation. This is because she was placed in the crew at the last minute after one of the astronauts was injured.

By 2061, Zenia was, along with Heywood Floyd, one of the only two surviving members of the Leonov mission.

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