X ~ Xylok - The Xylok were a mysterious crystalline race. The Xylok seemed to be made of clear crystals, but they had a very unusual structure and were actually alive. They had the ability to contact with other Xylok remotely and interface with computers. They could also apparently survive for millions of years. Due to their crystalline and computer-like nature, they were also vulnerable to 21st century Earth computer viruses.
Sarah Jane Smith's computer, Mr. Smith, is a Xylok.
Sarah Jane Smith's computer, Mr. Smith, is a Xylok.
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