Publication History
The original Leo first appeared in Avengers #72 (January 1970), and was created by Roy Thomas and Sal Buscema.
The character subsequently appears in Avengers #120-123 (February–May 1974), Ghost Rider #7 (August 1974), Iron Man #184 (July 1984), and West Coast Avengers #26 (November 1987), in which he is killed.
Leo appeared as part of the "Zodiac" entry in the Official Handbook of the Marvel Universe Deluxe Edition #20.
Read more about this topic: Leo (comics)
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