The Doctor finally meets his maker, who also looks incredibly like Robert Picardo, in this quasi-sequel to "Pathfinder," returning the viewer to the Alpha Quadrant, as well as Reg Barclay, Deanna Troi, and Admiral Paris.
True, we'd seen Lewis Zimmerman before (see the Deep Space Nine episode "Doctor Bashir, I Presume?"), but this is the first time actually see him in Voyager (besides the delusional appearance earlier in the series that also established Barclay as significant once again in Star Trek).
Some fans might have considered the whole thing a little too similar to what Next Generation did with Data and his own creator, Noonien Soong, but as Voyager typically did, this story and the relationship at its core, made more sense (at least the physical similarities, angry villagers), and as a bonus, is the first push The Doctor gets to the strong work he receives throughout the remainder of the series, returning him to glorious form after a little bit of foundering.
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Memory Alpha summary.