Schmidt (The Sirens of Time)

Schmidt was a member of Kapitänleutnant Walther Schwieger's crew aboard the U-20.

In an alternate timeline, Schmidt was used by Coordinator Vansell in an attempt to kill the Doctor before he could alter history. He escaped his restraints and attempted again to kill the Doctor, but was shot dead by an avatar of the Sirens of Time. (BFA: The Sirens of Time)