Development
Clarke noted that the film 2001 was criticized for not having any characters, except for HAL and that a great deal of the establishing story on Earth was cut from the film (and even from Clarke's novel). Early drafts of Clarke's story called the computer Socrates (a preferred name to Autonomous Mobile Explorer–5), with another draft giving the computer a female personality called Athena. This name was later used in Clarke and Stephen Baxter's Time Odyssey Series.
The earliest draft depicted Socrates as a roughly humanoid robot, and is introduced as overseeing Project Morpheus, which studied prolonged hibernation in preparation for long term space flight. As a demonstration to Senator Floyd, Socrates's designer, Dr. Bruno Forster, asks Socrates to turn off the oxygen to hibernating subjects Kaminski and Whitehead, which Socrates refuses, citing Asimov's First Law of Robotics.
In a later version, Poole is killed outside the spacecraft, triggering the need for Bowman to revive Whitehead. The revival does not go according to plan, and after briefly awakening, Whitehead dies. Athena announces "All systems of Poole now No–Go. It will be necessary to replace him with a spare unit." After this, Bowman decides to go out in a pod and retrieve the antenna, which is moving away from the ship. Athena will not originally let him go, citing a "Directive 15", but eventually relents.
During rehearsals Kubrick asked Stefanie Powers to supply the voice of HAL 9000 while searching for a suitably androgynous voice so the actors had something to react to. On the set, British actor Nigel Davenport played HAL. When it came to dubbing HAL in post-production, Kubrick had originally cast Martin Balsam, but as he felt Balsam "just sounded a little bit too colloquially American", he was replaced with Douglas Rain, who "had the kind of bland mid-Atlantic accent we felt was right for the part." Rain was only handed HAL's lines instead of the full script, and recorded them across a day and a half.
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