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The other non-hibernating astronaut on Discovery. He is indistinguishable from Bowman in most respects, except that he's the one who gets killed.
The three astronauts in hibernation on the Discovery.
An American security officer on the space station orbiting earth.
A Russian scientist, friends with Heywood Floyd.
An administrator on the moon.
Ralph's moon-born four-year-old daughter (see Symbols: Diana Halverson).
Chief Scientist on the moon.
The leader of the Others, the man-ape tribe that screams at Moon-Watcher's tribe across the river. One-Ear's tribe isn't helped by the slab, so One-Ear gets killed. Which doesn't seem fair, really.