"Life Line" - The Doctor transmits his program back to the Alpha Quadrant in order to save the life of his creator, Dr. Lewis Zimmerman, with the help of Reginald Barclay and Deanna Troi.
Starring Kate Mulgrew as Captain Janeway, Robert Beltran as Chakotay, Roxann Dawson as B'Elanna Torres, Robert Duncan McNeill as Tom Paris, Ethan Phillips as Neelix, Robert Picardo as The Doctor, Tim Russ as Tuvok, Jeri Ryan as Seven of Nine, Garrett Wang as Harry Kim.
Guest Starring Dwight Schultz as Barclay, Marina Sirtis as Deanna Troi, Tamera Craig Thomas as Haley, Jack Shearer as Admiral Hayes.
This episode was directed by Terry Windell. The story was by Robert Picardo & John Bruno. The teleplay was by Robert Doherty & Raf Green & Brannon Braga.
TV Guide online synopsis: Barclay's data transmitter opens a communication link from Earth to Voyager, whereupon the Doctor is used to find a cure for his dying creator.