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The Xylok are a mysterious race, the only example being Mr Smith.
- It can only be guessed what the biology and technology of the Xylok is like from the prime example, Mr Smith.
History
A Xylok fell to Earth and was trapped in it. Sarah Jane Smith was sent a crystal that had somehow made a conection with the trapped Xylok. This crystal boded with computers eventually becoming Mr Smith. He helps Sarah Jane on many occasions but belives he has a purpose and tries to crash the Moon into Earth to free his trapped form. This is stropped with a virus.
Mr Smith is then split off from the trapped Xylok and continues to work for Sarah Jane.