During
World War II, Captain Zahl was an officer in the
German Navy and commanded a
U-boat. As a U-boat captain, Zahl was ruthless and effective, achieving the highest kill number of any commander in the German fleet. After his boat was sank by bombs developed by
Niles Caulder, Zahl was crippled and forced to wear a neck brace. Years later, the
Teen Titans, together with
Robotman, track down Zahl and Rouge during their attempted takeover of
Zandia. With the help of
Changeling, the Titans put a stop to the villains' plans. Zahl fires at Robotman, but is killed after the bullets bounce off Robotman and strike him. ==Powers and abilities==