A mysterious Doctor was a time traveler whose visits were known of by the inhabitants of the 40th Century. Apparently, he had visited the late 30th Century. ("The Time Machine: A Sequel")

The Doctor's TARDIS time machine appeared at some point alongside The Time Machine in a warehouse of illegal time-travel devices. ("Star Trek - DTI: Watching the Clock")

This mysterious Doctor is implied to be the very same Doctor from the television series, Doctor Who.

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