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Doctor Who dictionary

Donna Noble /ˈdɑːnəˈnəʊbəl/: The most important woman in all of creation. Travelled with The Doctor helping several civilisations. She gained Time Lord abilities and knowledge, which transformed her into The DoctorDonna. However, in order to keep her from dying, The Doctor had to erase all memories of her travells through time and space from her mind. It is unclear if she ever regained those memories. She later married Shaun Temple.

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Doctor Who dictionary

Earth /ɜːθ/: Home planet of the Homo Sapiens and the Homo Reptilia. Also known as Sol III to extra-terrestrial cultures. Its core was formed around a Racnoss webstar, which provided the necessary gravitational pull to coalesce the planet from nearby matter. It attracted many alien invasion attempts throughout its multi-billion year history.