 Trying to unravel a plot to kill him, he travelled to Berlin for the 1936 Olympic Games, and eventually foiled a plot by American Fifth Columnists to kill President Roosevelt and his wife and gain important funding from the Germans and Italians to support Nazi sympathisers in the U.S. Not long afterwards, he fell in with Sabbath Raven, the owner of the "Mississippi Queen", a floating casino moored just outside US territorial waters, where he enjoyed a romantic relationship with her and they shared many of his adventures.In 1937, in an adventure in Europe he encountered Dr. Doom's parents and later Captain America villains Baron von Strucker and Baron Zemo and spent some time in Latveria and in Wakanda in Africa while foiling Nazi weapons intrigues involving the as-yet unnamed mineral Vibranium.Not long afterwards, having been evicted from his office, he began living aboard the "Mississippi Queen" at Sabbath's invitation.