An Atrean geologist, husband of Juliana Tainer, who works with the Enterprise-D in 2370 to reheat the cooling core of his planet, unaware that his wife is an android.
Pran Tainer appears in the seventh-season episode Inheritance. Atrea IV's molten core is solidifying, and he and Juliana come aboard to help plan a remedy: drilling to pockets of magma with the ship's phasers and injecting plasma to restart the flow.
He is taken aback when his wife announces to Data that she was once married to Noonien Soong and regards herself as Data's mother. It is a part of her life she has evidently told him little about.
Pran is injured in a cave-in during the work and has to withdraw, leaving Juliana and Data to finish. Data discovers that Juliana is an android built by Soong to replace his dead wife, and chooses not to tell her or Pran. Pran was played by William Lithgow.