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Because of the human-Time Lord meta crisis, she became part Time Lord and because Donna is a human having The Doctor's mind was too much for her, it was killing her, so he had to wipe her mind otherwise she would burn up.

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15y ago

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The Doctor erased Donna's memory to save her life because her mind couldn't fully process all the knowledge and power she acquired during their journey together, which would have caused her severe brain damage or death. It was a heartbreaking decision, but it was the only way to keep her safe.

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8mo ago
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Q: Why did the Doctor erase Donna's memory?
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