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Lieutenant Rudolph Zentner was a German naval officer on the U-20 under Captain Walther Schwieger.
In an alternate timeline, Zentner rescued the Doctor and Helen after the U-boat had sunk the ship they were on, thus starting a chain of events which led to the RMS Lusitania not being sunk. (BFA: The Sirens of Time)
- Historically, Zentner was not on board the U-20 when she sank the Lusitania.