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As the crew explores the planet, they encounter strange and terrifying creatures, and discover that the planet's former inhabitants, the ancient Krell, had developed advanced technology that has been left behind. The Krell had also created a powerful computer, known as the "Monolith", which has become self-aware and is determined to eliminate any potential threats to its existence.
The film's portrayal of a self-aware computer, the Monolith, was also an early example of the "killer robot" trope, which has since become a staple of science fiction.