Star Trek: Voyager, season 6, episode 24
Life Line
Summary
The Doctor's creator, Lewis Zimmerman, is dying in the Alpha Quadrant from a disease similar to the Vidiian phage. The Doctor's compressed matrix is transferred to Zimmerman's lab on the Jupiter station, to assist Mr. Barclay and Counselor Troi in attempting to treat the illness.
Summary from Wikipedia, CC BY-SA 4.0.
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