Zandow was the Strong-Man in Fritz Tiboldt's Circus in the 1940's. When the group was hired by the Nazi party to tour the United States and eliminate key military officials, Zandow would be loyal to the cause. When government agent Betsy Ross would witness the murder of Commissioner Newsome, Zandow and other circus members would attempt to capture her.
Captain America and Bucky would then attempt to stop them, however Zandow would knock Cap and Bucky out and make off with Ross. Later, Captain America would come to Betsy's rescue, beating the strong-man in combat, and smashing the operations of the circus.
Zandow's subsequent fate remains unrevealed, however as Fritz Tibolt would return to Germany and resume his circus, it is possible that Zandow resumed working for Tibolt. As such, it is noteworthy to mention that Tibolt would later be murdered by Nazi's who evaded capture in retribution of his failure, it is unknown if Zandow would have met the same fate.