Moon creator on how Gerty the robot is related to HAL

In the second of two exclusive behind-the-scenes clips from Moon, director Duncan Jones talks about the creation of the robot character, Gerty (voiced by Kevin Spacey).

In particular, he says, the filmmakers started by acknowledging that sci-fi fans would automatically think of Hal from 2001: A Space Odyssey.

"We could have either completely ignored that or we could have ... accepted that people are going to make that connection and then sort of take their expectation and take it in a very different direction," Jones says.

Moon centers on a solitary astronaut (Sam Rockwell) stationed on the moon to mine the precious gas that holds the key to reversing the Earth's energy crisis. He slowly begins to lose his grasp on reality as his assignment nears an end. The film also stars Kaya Scodelario as Rockwell's wife, Eve.

Moon drops on DVD and Blu-ray on Jan. 12.

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