Baron Zemo is the name of two fictional character, both supervillain, in various Marvel Comics comic book, notably Captain America and the Avengers. The original Baron Zemo was first seen in The Avengers #4 (March 1964); the second Baron Zemo first appeared in Captain America #168 (December 1973).
In 2009, Baron Helmut Zemo was ranked as IGN's 40th Greatest Comic Book Villain of All Time.
The original Baron Zemo was created by Stan Lee and Jack Kirby and was first seen in a flashback in The Avengers #4 (March 1964), though he did not actually appear in person and was not identified by name until The Avengers #6 (July 1964) and Sgt. Fury and His Howling Commandos #8 in the same month. Zemo was retroactively added into the history of Captain America upon the hero's reintroduction to the Silver Age two issues prior.
The character subsequently appears in The Avengers #7 (August 1964), #9-10 (October–November 1964), Tales of Suspense #60 (December 1964), and The Avengers #15 (April 1965), in which he is killed.
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