Liz Shaw was a brilliant scientist whose thesis on translating the human nervous system into electronic terms - cybernetics - attracted the attention of the Brigadier, and the Doctor.
Although the Doctor and Liz got on well initially, she soon realised that his scientific knowledge was so far ahead of hers that she would be relegated to little more than a laboratory assistant, so she left to continue her own academic work.
Lis Shaw returned as a Phantom in the Five Doctors.
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