Lloyd and story editor Gerry Davis came up with an intriguing way of writing the First Doctor out – as he was an alien being, they decided that he would have the power to change his body when it became worn out or seriously injured, a process that was called " renewal " but would later become known within the mythology of the series as " regeneration ".

Lloyd and story editor Gerry Davis came up with an intriguing way of writing the Doctor out-as he was an alien being, they decided that he would have the power to change his body when it became worn out or seriously injured, a process that would later become known within the mythology of the series as regeneration.

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